WO2024246909A1 - Smokeless barbecue grill - Google Patents

Abstract

A smokeless barbecue comprising a grilling area and working volume at least partly enclosed by a hood in fluid communication with a purification shaft. The purification shaft has a downward-flowing portion in fluid communication with an upward-flowing portion. An air pump draws air from the grilling area through the downward-flowing portion, through the upward-flowing portion of the purification shaft, from whence it exits the barbecue. The downward-flowing portion comprises a preliminary filter, typically a cassette comprising a granular material. Downstream of the preliminary filter are at least two filters, typically an electrostatic filter, a high-efficiency particulate absorbing (HEP A) filter, or a glass filter. Oily matter is removed and air is cooled by passage through the preliminary filter. When the preliminary filter is at ambient temperature, oily matter percolates out of the preliminary filter into a waste can.

Description

SMOKELESS BARBECUE GRILL

FIELD OF THE INVENTION

[0001] The present invention generally pertains to a barbecue comprising a system and method for removing oily matter and particulates from the exhaust gases of the barbecue.

BACKGROUND OF THE INVENTION

[0002] Barbecuing food generates particulates, mostly from the burning fuel but also from the matter being grilled, and also generates airborne droplets of oily matter, mostly from fat in food being grilled. For barbecue grills in the open air, this is not a significant problem since the oily matter and the particulates are rapidly dispersed and, typically are removed from the grilling area by any breezes present. However, for barbecue grills in enclosed areas such as indoor rooms or tents or in semi-enclosed areas such as balconies or roofed patios, the particulates and oily matter will both accumulate in the surrounding air and settle on the walls or ceiling of the enclosed or semi-enclosed area. The accumulated airborne particulates and oily matter can make it unpleasant to remain in in the area; the particulates and oily matter can also settle on the walls (if present), floor, and ceiling or roof of the area, necessitating cleaning.

[0003] The contaminated air can be removed from the vicinity via a chimney, with or without an air pump to encourage the contaminated air to leave the area via the chimney. Although this reduces the amount of contamination in the area, in order to efficiently remove the contaminated air from the area, the exit from the chimney must be outside the area; this can be awkward in a room, where the chimney would have to pass through an open window.

[0004] Barbecue grills with hoods can be provided with filters to remove oily matter and particulates from the air entering the hoods.

[0005] Patent IL259262 discloses a barbeque grill apparatus comprising: a charcoal barbeque device having a grilling grid in which the spaces thereof are adjustable, with the charcoal barbeque device installed in a grilling chamber; a purification shaft having an entrance installed at an upper side of the grilling chamber, the purification shaft ending with an exit opening; at least one smoke

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SUBSTITUTE SHEET (RULE 26) filter installed in the purification shaft; a blower for inflaming a fire of the charcoal barbeque device and generating an air barrier to the grilling chamber; a pump for shifting air in the air passage towards the exit and through the at least one smoke filter, thereby filtering smoke generated by the apparatus, i.e., providing a smokeless barbeque grill.

[0006] However, the filters in the filtered barbecue grills of the prior art typically clog with oily matter, reducing their efficiency and necessitating frequent cleaning or replacement of the filters, which can be expensive.

[0007] It is therefore a long felt need to provide a barbecue grill for use in enclosed or semienclosed areas that does not contaminate the air and that does not require frequent cleaning or frequent replacement of high-efficiency (and often expensive) filters.

SUMMARY OF THE INVENTION

[0008] It is an object of the present invention to disclose a barbecue comprising a system and method for removing oily matter and particulates from the exhaust gases of the barbecue.

[0009] It is another object of the present invention to disclose a smokeless barbecue comprising:

[0010] a body consisting a dedicated open space at the rear part to accommodate the gas cylinder;

[0011] a grilling area configured to cook food having a working volume above it, the working volume being at least partly enclosed, with a hood being above the working volume, at least a portion of the hood being fixed to a case of the smokeless barbecue;

[0012] a grill’s hood comprising an additional opening connected to a micro switch that communicates with the blower, configured to reduce smoke;

[0013] a unique grilling rack wherein all the oil drains preventing it from contacting fire that comes out of the burners;

[0014] the grill burners comprising a unique flame shields around them that significantly reduce the possibility of fire drifting upwards due to wind moving upwards during the suction action;

[0015] a purification shaft in fluid communication with the hood, the purification shaft having an exit at an upper rear portion of the case, the purification shaft having a downward-flowing portion in fluid communication with an upward-flowing portion, air

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SUBSTITUTE SHEET (RULE 26) being flowable from the hood through the downward-flowing portion, through the upward-flowing portion and thence through the exit; the upward-flowing portion comprising at least one first filter and at least one second filter;

[0016] the purification shaft further comprising at least one preliminary filter upstream of both the at least one first filter and the at least one second filter, the at least one preliminary filter comprising a granular material, the at least one preliminary filter selected from a group consisting of a first cleaning cassette, a fluidized bed or any combination thereof; and

[0017] an air pump in fluid communication with the purification shaft, the air pump being downstream of both the at least one first filter and the at least one second filter;

[0018] wherein the downward-flowing portion is configured to cool heated air flowing therein;

[0019] further wherein the at least one preliminary filter is configured such that, the at least one preliminary filter being at ambient temperature, liquid contained therewithin is percolatable to a lowest portion thereof and removable from the lowest portion thereof.

[0020] It is another object of the present invention to disclose a smokeless barbecue grill comprising a unitary (one-piece) grill that cannot be mounted on other existing grills.

[0021] It is another object of the present invention to disclose a smokeless barbecue grill comprising the combination of both gas and electric grills in one unit. The disclosed technology allows manufacturing of a variety of smokeless barbecue grill models that are powered only by electricity without gas, only by coals, or any combination thereof.

[0022] It is another object of the present invention to disclose a smokeless barbecue grill for use in apartments and condominiums with a closed or open balcony, but it can also be used commercially.

[0023] It is another object of the present invention to disclose a smokeless barbecue grill comprising an electrical outlet that connects the unit to the electricity grid.

[0024] It is another object of the present invention to disclose a smokeless barbecue comprising a body consisting a dedicated open space at the rear part to accommodate the gas cylinder; without no back blocking it and enabling improved user safety in cases of gas leakage.

[0025] It is another object of the present invention to disclose a smokeless barbecue comprising a grill’s hood comprising an additional opening connected to a micro switch that communicates

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SUBSTITUTE SHEET (RULE 26) with the blower, configured to reduce smoke, wherein when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal allowing high heat to cook the food faster. Such configuration also provides higher user safety.

[0026] It is another object of the present invention to disclose a smokeless barbecue comprising a unique grilling rack wherein all the oil drains preventing it from contacting fire that comes out of the burners (there is still contact of fire only on the food and not on the oil that comes out of it) thus preventing the phenomenon of the fire erupting upwards, therefore, significantly reducing the amount of smoke and enhancing user’s safety.

[0027] It is another object of the present invention to disclose a smokeless barbecue comprising a unique grilling rack consisting of two stainless steel main supports, positioned at different height levels that creates a slope necessary for oil drainage.

[0028] It is another object of the present invention to disclose a smokeless barbecue comprising a unique grilling rack consisting a series of semi-elliptical fins arranged in two rows welded to the stainless-steel supports at a downward angle. Furthermore, the fins are spaced slightly apart, with a second row aligned directly below the gaps of the first row configured to allow fire to penetrate the grid while maximizing oil drainage, thus minimizing combustion and fire eruptions, resulting in reduced amount of oil on the meat and less risk of burning.

[0029] It is another object of the present invention to disclose a smokeless barbecue comprising a unique grilling rack consisting of two ears welded to the right and left ends of the rack facilitating the easy placement and removal of the rack and allowing convenient cleaning of both the rack and the burners.

[0030] It is another object of the present invention to disclose a smokeless barbecue comprising a unique grilling rack consisting an oil drainage channel directing the oil from the rack to a removable drain tank. The tank contains a convenient handle configured to allow manual easy removal, disposal of oil and cleaning before being reinstalled as needed.

[0031] It is another object of the present invention to disclose a smokeless barbecue comprising unique flame shields around the burners configured to significantly reduce the possibility of fire drifting upwards due to wind moving upwards during the suction action, therefore enhancing user’s safety.

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SUBSTITUTE SHEET (RULE 26) [0032] It is another object of the present invention to disclose a smokeless barbecue comprising unique flame shields around the burners consisting of a lower and upper covers that protects the burners from being extinguished by the wind suction generated by the blower. The lower cover including two diagonally blades welded, which serve to protect against the wind's suction force that affects the gas exit from the burners ensuring that the gas flow remains stable and uninterrupted despite external wind forces. The upper cover has a U-shaped design that offers additional protection against wind pressure while allowing the free flow of gas. This configuration prevents the wind suction force from directly colliding with the gas outlet, thereby maximizing heating efficiency and safeguarding the burners from dirt and debris.

[0033] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the first cleaning cassette is comprised within the downwardflowing portion.

[0034] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the granular material comprises an active material selected from a group consisting of carbonate beads, exfoliated vermiculite, perlite or any combination thereof.

[0035] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the granular material comprises an inert material selected from a group consisting of inert beads, pebbles or any combination thereof.

[0036] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the purification shaft and the first cleaning cassette are configured to have a property selected from a group consisting of the first cleaning cassette is emplaceable in the purification shaft, the first cleaning cassette and is removable from the purification shaft or any combination thereof.

[0037] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the first cleaning cassette is configured to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

[0038] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein a lowest portion of the purification shaft comprises a waste

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SUBSTITUTE SHEET (RULE 26) container.

[0039] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the waste container and the purification shaft are configured to have a property selected from a group consisting of the waste container is removable from the lowest portion of the purification shaft, the waste container is emplaceable in the lowest portion of the purification shaft, or any combination thereof.

[0040] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the waste container is configured to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

[0041] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the at least one first filter is selected from a group consisting of a carbon particulate filter, a glass filter or any combination thereof.

[0042] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the at least one second filter is selected from a group consisting of an electrostatic filter, a high-efficiency particulate absorbing (HEP A) filter, a glass filter, or any combination thereof.

[0043] It is another object of the present invention to disclose a smokeless barbecue comprising electrostatic filters located at the back side of the smokeless barbecue grill enabling their removal for maintenance and cleaning of the barbecue grill by easily pulling them out without the need to mess with the electricity or disassemble electrical wires.

[0044] It is another object of the present invention to disclose a smokeless barbecue comprising electrostatic filters consisting of filter casing that includes a handle for their safe removal. The filter casing features nets at the top and bottom that allow smoke to pass through the filters, which then emit filtered air.

[0045] It is another object of the present invention to disclose a smokeless barbecue comprising electrostatic filters consisting A small hole, in the back of the casing that accommodates a permanent electrical pin connected to the barbecue's electrical system and activates the filters. In addition, four rails, each equipped with a spring tab at the front, lock the filter in place and prevent movement. The connector's upper part being a smooth circle with a slightly larger diameter than the electric pin, while the lower part being a screw that attaches to the

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SUBSTITUTE SHEET (RULE 26) electrostatic filter's screw rod. The electrostatic electric filters, in a set of two, eliminate 95% of smoke, producing cleaner and healthier air.

[0046] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the downward-flowing portion comprises at least one baffle.

[0047] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the first cleaning cassette comprises at least one baffle.

[0048] It is another object of the present invention to disclose the smokeless barbecue as described in any of the above, wherein the at least one baffle is configured to affect the airflow in a manner selected from a group consisting of reducing linearity of the airflow, inducing turbulence in the airflow, increasing turbulence in the airflow, changing the direction of the airflow, inducing serpentine airflow, and any combination thereof.

[0049] It is another object of the present invention to disclose a method for reducing smoke and air pollutants in a comprising: providing the smokeless barbecue comprising:

[0050] a grill’s hood comprising an additional opening connected to a micro switch that communicates with the blower, configured to reduce smoke, wherein when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal allowing high heat to cook the food faster;

[0051] a grilling area configured to cook food having a working volume above it, the working volume being at least partly enclosed, with a hood being above the working volume, at least a portion of the hood being fixed to a case of the smokeless barbecue;

[0052] a unique grilling rack wherein all the oil drains preventing it from contacting fire that comes out of the burners (there is still contact of fire only on the food and not on the oil that comes out of it) thus preventing the phenomenon of the fire erupting upwards, therefore, significantly reducing the amount of smoke;

[0053] the grill burners comprising a unique flame shields around them that significantly reduce the possibility of fire drifting upwards due to wind moving upwards during the suction action;

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SUBSTITUTE SHEET (RULE 26) [0054] a purification shaft in fluid communication with the hood, the purification shaft having an exit at an upper rear portion of the case, the purification shaft having a downward-flowing portion in fluid communication with an upward-flowing portion, air being flowable from the hood through the downward-flowing portion, through the upward-flowing portion and thence through the exit; the upward-flowing portion comprising at least one first filter and at least one second filter;

[0055] the purification shaft further comprising at least one preliminary filter upstream of both the at least one first filter and the at least one second filter, the at least one preliminary filter comprising a granular material, the at least one preliminary filter selected from a group consisting of a first cleaning cassette, a fluidized bed or any combination thereof; and,

[0056] an air pump in fluid communication with the purification shaft, the air pump being downstream of both the at least one first filter and the at least one second filter; ensuring the at least one preliminary filter is functional; ensuring the at least one first filter is functional; ensuring the at least one second filter is functional; activating the air pump; and providing heat to the grilling area; thereby the air pump drawing air from the grilling area through the purification shaft and through the exit via the at least one preliminary filter, the at least one first filter and the at least one second filter; wherein the downward-flowing portion is configured to cool heated air flowing therein; further wherein the at least one preliminary filter is configured such that, the at least one preliminary filter being at ambient temperature, liquid contained therewithin is percolatable to a lowest portion thereof and removable from the lowest portion thereof ; further wherein the micro grill hood connected to a micro switch and communicates with the blower, the unique grilling rack, and flame shields around the grill burners are configured to reduce smoke and air pollutants selected from a group consisting of SO2, NOX, CO, CO2 and any combination thereof.

[0057] It is another object of the present invention to disclose the method as described in any of the above, in which the smoke and air pollutants are reduced by at least 75%.

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SUBSTITUTE SHEET (RULE 26) [0058] It is another object of the present invention to disclose the method as described in any of the above, in which the SO2 is reduced by at least 75%.

[0059] It is another object of the present invention to disclose the method as described in any of the above, in which the NOX is reduced by at least 80%.

[0060] It is another object of the present invention to disclose the method as described in any of the above, in which the CO is reduced by at least 90%.

[0061] It is another object of the present invention to disclose the method as described in any of the above, in which the CO2 is reduced by at least 90%.

[0062] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the first cleaning cassette comprised within the downward-flowing portion.

[0063] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the granular material comprising an active material selected from a group consisting of carbonate beads, exfoliated vermiculite, perlite or any combination thereof.

[0064] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the granular material comprising an inert material selected from a group consisting of inert beads, pebbles or any combination thereof.

[0065] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the purification shaft and the first cleaning cassette having a property selected from a group consisting of the first cleaning cassette is emplaceable in the purification shaft, the first cleaning cassette and is removable from the purification shaft or any combination thereof.

[0066] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of configuring the first cleaning cassette to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

[0067] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing a lowest portion of the purification shaft

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SUBSTITUTE SHEET (RULE 26) comprising a waste container.

[0068] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the waste container and the purification shaft having a property selected from a group consisting of the waste container is removable from the lowest portion of the purification shaft, the waste container is emplaceable in the lowest portion of the purification shaft, or any combination thereof.

[0069] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of configuring the waste container having a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

[0070] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of selecting the at least one first filter from a group consisting of a carbon particulate filter, a glass filter or any combination thereof.

[0071] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of selecting the at least one second filter from a group consisting of an electrostatic filter, a high-efficiency particulate absorbing (HEPA) filter, a glass filter, or any combination thereof.

[0072] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of configuring said electrostatic filters located at the back side of the smokeless barbecue grill enabling their removal for maintenance and cleaning of the barbecue grill by easily pulling them out without the need to mess with the electricity or disassemble electrical wires.

[0073] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the downward-flowing portion comprising at least one baffle.

[0074] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of providing the first cleaning cassette comprising at least one baffle.

[0075] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of configuring the at least one baffle to affect the airflow in a manner selected from a group consisting of reducing linearity of the airflow,

IO

SUBSTITUTE SHEET (RULE 26) inducing turbulence in the airflow, increasing turbulence in the airflow, changing the direction of the airflow, inducing serpentine airflow, and any combination thereof.

[0076] It is another object of the present invention to disclose a unitary smokeless barbecue comprising: a housing comprising there within:

[0077] a grilling area configured to cook food having a working volume above it, the working volume being at least partly enclosed, with a hood being above the working volume, at least a portion of the hood being fixed to the housing of the smokeless barbecue;

[0078] a body consisting a dedicated open space at the rear part to accommodate the gas cylinder without no back blocking it and enabling improved user safety in cases of gas leakage.

[0079] a grill’s hood comprising an additional opening connected to a micro switch that communicates with the blower, configured to reduce smoke, wherein when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal allowing high heat to cook the food faster. Such configuration also provides higher user safety;

[0080] a unique grilling rack wherein all the oil drains preventing it from contacting fire that comes out of the burners (there is still contact of fire only on the food and not on the oil that comes out of it) thus preventing the phenomenon of the fire erupting upwards, therefore, significantly reducing the amount of smoke;

[0081] the grill burners comprising a unique flame shields around them that significantly reduce the possibility of fire drifting upwards due to wind moving upwards during the suction action;

[0082] a purification shaft in fluid communication with the hood, the purification shaft having an exit at an upper rear portion of the housing, the purification shaft having a downward-flowing portion in fluid communication with an upward-flowing portion, air being flowable from the hood through the downward-flowing portion, through the upward-flowing portion and thence through the exit; the upward-flowing portion comprising at least one first filter and at least one second filter;

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SUBSTITUTE SHEET (RULE 26) [0083] the purification shaft further comprising at least one preliminary filter upstream of both the at least one first filter and the at least one second filter, the at least one preliminary filter comprising a granular material, the at least one preliminary filter selected from a group consisting of a first cleaning cassette, a fluidized bed or any combination thereof; and

[0084] an air pump in fluid communication with the purification shaft, the air pump being downstream of both the at least one first filter and the at least one second filter; wherein the downward-flowing portion is configured to cool heated air flowing therein; further wherein the at least one preliminary filter is configured such that, the at least one preliminary filter being at ambient temperature, liquid contained therewithin is percolatable to at least one portion thereof and removable from the at least one portion thereof.

[0085] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the at least one preliminary filter is comprised within the downward-flowing portion.

[0086] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the granular material comprises an active material selected from a group consisting of carbonate beads, exfoliated vermiculite, perlite or any combination thereof.

[0087] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the granular material comprises an inert material selected from a group consisting of inert beads, pebbles or any combination thereof.

[0088] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the purification shaft and the first cleaning cassette are configured to have a property selected from a group consisting of the first cleaning cassette is emplaceable in the purification shaft, the first cleaning cassette and is removable from the purification shaft or any combination thereof.

[0089] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the first cleaning cassette is configured to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

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SUBSTITUTE SHEET (RULE 26) [0090] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein said at least one portion of the unitary smokeless barbecue comprises at least one waste container.

[0091] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the waste container and the unitary smokeless barbecue are configured to have a property selected from a group consisting of the at least one waste container is removable from the at least one portion of the unitary smokeless barbecue, the at least one waste container is emplaceable in the at least one portion of the unitary smokeless barbecue, or any combination thereof.

[0092] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the at least one waste container is configured to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

[0093] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the at least one first filter is selected from a group consisting of a carbon particulate filter, a glass filter or any combination thereof.

[0094] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the at least one second filter is selected from a group consisting of an electrostatic filter, a high-efficiency particulate absorbing (HEPA) filter, a glass filter, or any combination thereof.

[0095] It is another object of the present invention to disclose the method as described in any of the above, additionally comprising a step of configuring said electrostatic filters located at the back side of the smokeless barbecue grill enabling their removal for maintenance and cleaning of the barbecue grill by easily pulling them out without the need to mess with the electricity or disassemble electrical wires.

[0096] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein a member of a group consisting of the downwardflowing portion, the first cleaning cassette, the horizontal-flowing portion or any combination thereof comprises at least one baffle.

[0097] It is another object of the present invention to disclose the unitary smokeless barbecue as described in any of the above, wherein the at least one baffle is configured to affect the airflow

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SUBSTITUTE SHEET (RULE 26) in a manner selected from a group consisting of reducing linearity of the airflow, inducing turbulence in the airflow, increasing turbulence in the airflow, changing the direction of the airflow, inducing serpentine airflow, and any combination thereof.

BRIEF DESCRIPTION OF THE FIGURES

[0098] In order to better understand the invention and its implementation in practice, a plurality of embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, wherein:

[0099] Fig. 1 schematically illustrates a barbecue grill of the prior art;

[0100] Fig. 2A and 2B schematically illustrates a front and rear view of an embodiment of a barbecue grill of the present invention;

[0101] Fig. 3A and 3B schematically illustrates an embodiment of the grill's hood in the present invention;

[0102] Fig. 4A and 4B schematically illustrates an embodiment of the grilling rack in the present invention;

[0103] Fig. 5A, 5B and 5C schematically illustrates an embodiment of the flame shields surrounding the burners in the present invention;

[0104] Fig. 6 schematically illustrates an embodiment of a fluidized bed in the upward-flowing portion of the purification shaft;

[0105] Fig. 7A and 7B schematically illustrates embodiments of the purification shaft comprising baffles.

[0106] Fig. 8A, 8B and 8C schematically illustrates an embodiment of electrostatic filters in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0107] The following description is provided, alongside all chapters of the present invention, so as to enable any person skilled in the art to make use of the invention and sets forth the best modes contemplated by the inventor of carrying out this invention. Various modifications, however, will remain apparent to those skilled in the art, since the generic principles of the

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SUBSTITUTE SHEET (RULE 26) present invention have been defined specifically to provide a means and method for barbecue comprising a system and method for removing oily matter and particulates from the exhaust gases of the barbecue.

[0108] Unless defined otherwise the following abbreviations are used herein:

[0109] "DSCM" stands for "Dry Standard Cubic Meter";

[0110] "mg" stands for "milligram";

[0111] "Kg" stands for "Kilogram";

[0112] "NDIR" stands for "non-dispersive infrared";

[0113] "TA-LUFT" - stands for "Technical Instructions on Air Quality Control";

[0114] "EPA-6c" stands for "EPA Method 6C: Determination of Sulfur Dioxide Emissions from Stationary Sources";

[0115] "EPA-7e" stands for "EPA Method 7E: Determination of Nitrogen Oxides Emissions from Stationary Sources";

[0116] "EPA-10" stands for "EPA Method 10: Determination of Carbon Monoxide Emissions from Stationary Sources";

[0117] "EPA-3a" stands for "EPA Method 3A: Determination of Oxygen and Carbon Dioxide Concentrations in Emissions from Stationary Sources";

[0118] "SO₂" stands for "Sulfur Dioxide";

[0119] "NOX" stands for "Nitrogen Oxides";

[0120] "CO" stands for "Carbon Monoxide"; and,

[0121] "CO₂" stands for "Carbon Dioxide"

[0122] The present invention comprises a barbecue grill with filters to remove oily matter and particulates from the exhaust gases so that the barbecue grill does not contaminate the surrounding air.

[0123] Fig. 1 shows a portable barbecue grill (100) of the prior art. The barbecue grill (100) comprises a grilling area (20). Heated, grease -laden and particulate -laden air is drawn upward

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SUBSTITUTE SHEET (RULE 26) toward the hood by means of an air pump (50). An air blower (12) generates an air curtain (16a) to prevent grease-laden and particulate -laden air from leaving the grill area from the front of the barbecue grill (100). Some of the blown air from the air blower (12) is directed via a second outlet towards the grilling area (20) to encourage burning of charcoal in the grilling area (20).

[0124] The grease-laden and particulate-laden air enters a purification shaft (60) and passes through the shaft (arrows) to the back of the barbecue grill (100), downward through a vertical portion of the purification shaft (60), and then horizontally forward towards the front of the barbecue grill (100). The upper horizontal portion of the purification shaft (60) comprises a smoke filter (52), which can comprise an electrostatic filter, an activated carbon filter or a glass filter. The air then follows the purification shaft (60) downward and through a second horizontal section of the purification shaft (60) to the back of the barbecue grill (100), through an air pump (50) and upward through a second vertical section of the purification shaft (60), exiting the purification shaft (60) via an air exit (26). The second horizontal section of the purification shaft (60) comprises a group of smoke filters (52) upstream of the air pump (50). The smoke filters in the group of smoke filters (52) can comprise electrostatic filters, activated carbon filters, or glass filters.

[0125] Fig. 2A and 2B schematically illustrates an embodiment of a barbecue grill (1000) of the present invention. The barbecue grill (1000) comprises a body (110) with a grilling area (120). The grilling area (120) can be heated by burning charcoal, propane gas, natural gas or any other conventional barbecuing fuel. In some embodiments, a propane gas cylinder is stored in a dedicated open space (220) at the rear part of the body (110) beneath the clean air outlet (111). In some embodiments, the body comprises one or more temperature controllers, such as one of more conventional knobs (not shown) to control the flow of gas to the one or more propane or natural gas burners. For charcoal fuel, the temperature controller can control the amount of air reaching the charcoal in order to control the temperature of the air reaching the grill. In some embodiments, the barbecue grill comprises a thermometer (not shown) and temperature display (not shown) to measure and display the air temperature in the working volume. In preferred embodiments the electric power cable (112) of the unitary barbecue grill is located at the back side of the body (110).

16

SUBSTITUTE SHEET (RULE 26) [0126] The hood (130) comprises two portions, a fixed portion (130') and a movable portion (130”). The movable portion is rotatably attached to the front of the fixed portion (130') and can be rotatably raised and lowered to alter the amount of air entering or leaving the working volume (125) via the front of the barbecue grill (1000).

[0127] The fixed portion of the hood (130') is in fluid communication with a purification shaft (200) at the rear of the barbecue grill (1000); airflow through the purification shaft (200) is indicated by the arrows. Air is pulled through the purification shaft (200) by a pump (150) situated near the exit (160) from the purification shaft (200).

[0128] In the embodiment shown in Fig. 2B, in the purification shaft (200), the air flows downward from the hood (130') and through a first cleaning cassette (190) comprising at least one granular material (192) configured to remove contaminants, especially organic contaminants such as oily matter from the air passing therethrough. The air then flows upward through at least one first filter (180), which is typically an activated carbon filter but can be a glass filter or any conventional filter configured to remove organic contaminants from the air or any combination thereof, and at least one second filter (170), which can be an electrostatic filter, a high-efficiency particulate absorbing (HEPA) filter, a glass filter, any other conventional filter configured to remove particulates from the air, or any combination thereof. In the embodiment shown, the at least one first filter (180) removes organic contaminants and the at least one second filter (170) removes particulates. In some embodiments, the particulate filter(s) (170) can be upstream of the organic -removal filter(s) (180). In some embodiments, particulate filter(s) (170) and organic-removal filter(s) (180) can alternate.

[0129] After passing through the at least one second filter (170), the air passes through an air pump (150) and through the exit (160) of the purification shaft (200) into the external atmosphere.

[0130] The downward-flowing portion of the purification shaft (200') preferably comprises a door or other opening on a side thereof to enable the first cleaning cassette (190) to be removed for cleaning, emptying, refilling, replacement or any combination thereof.

[0131] The granular material (192) can comprise carbonate beads, vermiculite, perlite, any other conventional material configured to remove organic contaminants from air, or any combination thereof to remove contaminants, such as, but not limited to, oily contaminants from the air passing therethrough. The granular material (192) can further comprise inert material such as, but not limited to, inert beads or pebbles to alter the airflow by, for non -limiting example,

17

SUBSTITUTE SHEET (RULE 26) increasing the dwell time in the first cleaning cassette (190), altering the direction of the airflow, reducing linearity of the airflow, increasing turbulence in the airflow, adding turbulence to the airflow or any combination thereof. The alteration of the airflow can be configured to enhance the removal of contaminants from the airflow through the first cleaning cassette (190).

[0132] Inert material in the first cleaning cassette (190) can also be configured to, when the first cleaning cassette (190) is not in use and is at ambient temperature, reduce retention of the contaminants in the first cleaning cassette (190) and/or aid in transferring the contaminants to the bottom end of the first cleaning cassette (190) and, preferably, from thence into the waste container (210).

[0133] Carbonate beads, vermiculite and perlite, as well as inert beads or pebbles, are relatively inexpensive, are readily available and can be disposed of without needing special precautions so that, in some embodiments, used contents of the first cleaning cassette (190) can be dumped out of the first cleaning cassette (190) and fresh contents poured in, making replacement of the contents of the first cleaning cassette (190) fast, easy and inexpensive. In some embodiments, a used first cleaning cassette (190) can easily be removed from the downward-flowing portion of the purification shaft (200') and a new first cleaning cassette (190), containing new granular material (192), inserted.

[0134] Preferably, the vermiculite is exfoliated vermiculite. The vermiculite can be coated with ceramic oxide, be impregnated with nano silver or be coated or impregnated with any other conventional material used for absorbing odors and volatiles.

[0135] For example, exfoliated vermiculite has a cation exchange capacity of up to 1,000 milliequivalents per kg), so it is commonly used for pollution-control of air in mines and gases in industrial processes. In addition to its ion exchange properties, exfoliated vermiculite can retain liquids within the inter-laminar voids of the individual particles, as well as between the particles themselves. Therefore, exfoliated vermiculite is a good choice for a first filter, removing both oily matter and other liquid contaminants from the air and also removing particulates.

[0136] The downward-flowing portion of the purification shaft (200') is configured to allow cooling of the contaminated air. Typically, during passage through the first cleaning cassette

18

SUBSTITUTE SHEET (RULE 26) (190), the temperature of the contaminated air will drop from greater than 60°C to less than 30°C.

[0137] In some embodiments, the first cleaning cassette (190) at least partly fills the downwardflowing portion of the purification shaft (200'). Preferably, the first cleaning cassette (190) can be cleanable, reusable, replaceable, fillable, emptiable, reversibly emplaceable and any combination thereof.

[0138] Fig 3A and 3B schematically illustrates an embodiment of the grill's hood 130 located above the grill burners 500 in the present invention. In preferred embodiments, the micro switch 1310 communicates with the blower, configured to reduce smoke in lid's open and closed positions, wherein when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal allowing high heat to cook the food faster. Such configuration also provides higher user safety.

[0139] Fig. 4A and 4B schematically illustrates an embodiment of the grilling rack (350) in the present invention designed to enhance its functionality and safety. In preferred embodiments, the grilling rack comprises two stainless steel main supports (3501 and 3502), positioned at different height levels that creates a slope necessary for oil drainage. The grid comprises a series of semi-elliptical fins (3503) arranged in two rows, and welded to the stainless-steel supports (3501 and 3502) at a downward angle. In preferred embodiments, the fins are spaced slightly apart, with a second row aligned directly below the gaps of the first row configured to allow fire to penetrate the grid while maximizing oil drainage, thus minimizing combustion and fire eruptions, resulting in reduced amount of oil on the meat and less risk of burning. Two ears (3504) are welded to the right and left ends of the rack facilitating the easy placement and removal of the rack and allowing for convenient cleaning of both the rack and the burners. An oil drainage channel (3505) directs the oil from the rack to a removable drain tank (3506). An internal slope within the channel guides the oil towards an opening at the lower end, ensuring efficient drainage into a removable tank. The tank contains of a convenient handle for manual easy removal, disposal of oil and cleaning before being reinstalled as needed.

[0140] Fig. 5A, 5B and 5C schematically illustrates an embodiment of the flame shields surrounding the burners (500) in the present invention designed to enhance its functionality and safety. In preferred embodiments, the flame shield comprises a lower cover (500') and upper cover (500") that protects the burners from being extinguished by the wind suction

19

SUBSTITUTE SHEET (RULE 26) generated by the blower. The lower cover (500') includes two diagonally blades welded, which serve to protect against the wind's suction force that affects the gas exit from the burners. This configuration ensures that the gas flow remains stable and uninterrupted despite external wind forces. The upper cover (500") has a U-shaped design that offers additional protection against wind pressure while allowing the free flow of gas. This configuration prevents the wind suction force from directly colliding with the gas outlet, thereby maximizing heating efficiency and safeguarding the burners from dirt and debris. Together, these components form a robust flame shield system that ensures optimal burner performance and safety in windy conditions.

[0141] As shown in Fig. 6, in some embodiments, there is a fluidized bed (195) as the most upstream of the filters in the upward-flowing portion of the purification shaft (200"). A fluidized bed is known to increase exposure of the gas passing through the fluidized bed to the solid particles in the fluidized bed, thus enhancing removal of contaminants from the air passing therethrough. In such embodiments, the granular material in the fluidized bed (195) comprises vermiculite, perlite, carbonate beads, any conventional fluidized bed material configured to remove organic and/or particulate material from air passing therethrough, or any combination thereof.

[0142] The purification shaft can comprise a first cleaning cassette (190) in the downward-flowing portion of the purification shaft (200'), a fluidized bed (195) in the upward-flowing portion of the purification shaft (200") or any combination thereof.

[0143] When the barbecue grill (1000) is not in use, the purification shaft (200) cools to ambient temperature. When it cools, oily matter can be released from the particles of vermiculite. The oily matter can then percolate downward. In some embodiments, the oily matter can exit from the bottom of the first cleaning cassette (190) and pass into a waste container (210) underneath the purification shaft (200), thus prolonging the life of the granular material (192) in the first cleaning cassette (190). The waste container (210) can be removable, emplaceable, emptiable, cleanable or any combination thereof.

[0144] The removal of oily matter from the contaminated air in the first cleaning cassette (190) both prolongs the lives of the first filter(s) (180) and the second filter(s) (170) and improves their operating efficiency, since oily matter can clog the first filter(s) (180) and the second filter(s) (170), both decreasing the filters' intrinsic efficiency (by reducing exposure of the gas

20

SUBSTITUTE SHEET (RULE 26) to the filtering elements) and decreasing the filters' effective efficiency (by reducing airflow through the filters).

[0145] Fig. 7A schematically illustrates a cleaning cassette (190) comprising granular material (192) and further comprising at least one baffle (194). The direction of the airflow is schematically indicated by the arrows. The at least one baffle (194) is configured to improve the exposure of the contaminated air to the contents of the first cleaning cassette (190), thereby enhancing removal of contaminants from the air passing therethrough and also enhancing cooling of the air passing therethrough. The exposure is improvable by reducing the laminarity of the airflow, by adding turbulence to the airflow, by increasing turbulence in the airflow, by increasing the exposure of the air to the adsorbing or absorbing contents of the first cleaning cassette (190), by increasing the dwell time of the air in the first cleaning cassette (190), by changing the direction of the airflow, by inducing serpentine airflow or any combination thereof. Other physical mechanisms may also be active in improving contaminant removal.

[0146] Fig. 7B schematically illustrates an embodiment with a fluidized bed (195) that does not have a cleaning cassette (190), where the downward-flowing portion (200') of the purification shaft comprises baffles (194). In this embodiment, the waste container (210) is underneath the upward-flowing portion (200") of the purification shaft.

[0147] In embodiments with baffles (194) in the downward-flowing portion (200') of the purification shaft but without a cleaning cassette (190) in the downward-flowing portion (200') of the purification shaft, the baffles enhance the cooling of the downward-flowing air by increasing the dwell time of the air in the downward-flowing portion (200') of the purification shaft, by conducting heat to the outside of the downward-flowing portion (200') of the purification shaft, by changing the direction of the airflow, by inducing serpentine flow or any combination thereof.

[0148] In preferred embodiments, the upward-flowing portion (200") comprises at least one door or other conventional means of entry, the door(s) allowing removal, emplacement, cleaning or any combination thereof of the plurality of filters (180, 170) and/or the fluidized bed (195).

[0149] Fig. 8A, 8B and 8C schematically illustrates an embodiment of electrostatic filters in the present invention designed to enhance its functionality and safety. In preferred embodiments, the electrostatic filters (370) are designed for easy removal from the back side of the smokeless barbecue without interfering with any electrical components. They are safe to

21

SUBSTITUTE SHEET (RULE 26) touch, preventing electric shock, and can be replaced without professional assistance. The filter casing (3701) includes a handle (3702) for safe removal without interacting with electrical components. The filter casing (3701) features nets (3703) at the top and bottom that allow smoke to pass through the filters, which then emit filtered air. A small hole (3704), in the back of the casing accommodates a permanent electrical pin connected to the barbecue's electrical system. Four rails, each equipped with a spring tab (3705) at the front, lock the filter in place and prevent movement. A connector (3706) integrates the electrostatic filter with the power pin to activate the filter. The connector's upper part (3706') is a smooth circle with a slightly larger diameter than the electric pin, while the lower part (3706") is a screw that attaches to the electrostatic filter's screw rod. The electrostatic electric filters, in a set of two, eliminate 95% of smoke, producing cleaner and healthier air.

EXAMPLE 1

[0150] The purpose of this example is to present the analysis results obtained in order to assess the reduction of smoke using the present invention.

[0151] The analysis was conducted at Ecological laboratories A.P. Ltd., a Company for air sampling and monitoring. The objective was to determine the levels of smoke and air pollutants while the barbecue operated in three different situations:

[0152] Grill Hood Fully Open and blower operating;

[0153] Grill Hood Closed and blower operating;

[0154] Grill Hood Fully Open and no operative blower;

[0155] Table 1 : Reduction of smoke and air pollutants

[0156] The results indicate a reduction for all levels of all air pollutants when the barbecue disclose in the present invention, including its blower are operative, regardless of the opening of the grill's hood. The levels for SO2, CO and CO2 were reduced by 90 - 95%; and the level for NX was reduced by 80%. The most noticeable reduction is for CO that was reduced from 395.10 mg/dscm when the grill's hood is open and blower is not operative to 14.2 (grill's hood open) or 21.20 (grill's hood closed) mg/DSCM when the blower is operative.

[0157] In conclusion, the disclosed smokeless barbecue successfully reduced smoke and air pollutants.

22

SUBSTITUTE SHEET (RULE 26)

SUBSTITUTE SHEET (RULE 26)

Claims

CLAIMS:

1. A smokeless barbecue (1000) comprising: a grilling area (120) configured to cook food having a working volume (125) above it, the working volume (125) being at least partly enclosed, with a hood (130) being above the working volume, at least a portion of the hood (130') being fixed to a case (110) of the smokeless barbecue (1000), a dedicated open (220) space at the rear part of the barbecue body being the gas cylinder location; a grill hood connected to a micro switch (1310) that communicates with the blower, configured to controls the suction power, when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal; a unique grilling rack (350) configured to drain all the and preventing fire erupting upwards; the grill burners (500) comprising flame shields (500' and 500") around them configured to significantly reduce the possibility of fire drifting upwards; a purification shaft (200) in fluid communication with the hood (130), the purification shaft (200) having an exit (160) at an upper rear portion of the case (110), the purification shaft (200) having a downward-flowing portion (200') in fluid communication with an upward- flowing portion (200"), air being flowable from the hood (130) through the downward- flowing portion (200'), through the upward-flowing portion (200") and thence through the exit (160); the upward-flowing portion (200') comprising at least one first filter (180) and at least one second filter (170); the purification shaft (200) further comprising at least one preliminary filter (190, 195) upstream of both the at least one first filter (180) and the at least one second filter, said electrostatic filters (170) being removable, the at least one preliminary filter (190, 195) comprising a granular material (192), the at least one preliminary filter (190, 195) selected from a group consisting of a first cleaning cassette (190), a fluidized bed (195) or any combination thereof; and, an air pump (150) in fluid communication with the purification shaft (200), the air pump (150) being downstream of both the at least one first filter (180) and the at least one second filter (170);

24

SUBSTITUTE SHEET (RULE 26) wherein the downward-flowing portion (200') is configured to cool heated air flowing therein; further wherein the at least one preliminary filter (190, 195) is configured such that, the at least one preliminary filter (190, 195) being at ambient temperature, liquid contained therewithin is percolatable to a lowest portion thereof and removable from the lowest portion thereof.

2. The smokeless barbecue of claim 1, wherein said barbecue grill is a unitary (one-piece) grill that cannot be mounted on other existing grills.

3. The smokeless barbecue of claim 1, wherein said barbecue grill comprises in the unit a gas system, and electric system or both.

4. The smokeless barbecue of claim 1 , wherein the power of said barbecue grill is selected from the group consisting of electricity, gas, coals or any combination thereof.

5. The smokeless barbecue of claim 1, wherein said barbecue grill is used in an outdoor space, indoor space or any combination thereof.

6. The smokeless barbecue of claim 1 , wherein said barbecue grill comprising an electrical outlet that connects the unit to the electrical grill.

7. The smokeless barbecue of claim 1, wherein said barbecue grill body comprises an open space (220) at the rear part to accommodate the gas cylinder.

8. The smokeless barbecue of claim 1, wherein said barbecue grill's hood comprises an additional opening connected to a micro switch (1310) that communicates with the blower, configured to reduce smoke.

9. The smokeless barbecue of claim 1, wherein said barbecue grill comprising an unique grilling rack (350) configured to drain all the oil and prevent it from contacting fire that comes out of the burners.

10. The smokeless barbecue of claim 9, wherein said barbecue grilling rack (350) comprising two stainless steel main supports (3501 and 3502), positioned at different height levels that creates a slope necessary for oil drainage. The rack comprises a series of semi-elliptical fins (3503) arranged in two rows, with the second row aligned directly below the gaps of the first row and welded to the stainless-steel supports (3501 and 3502) at a downward angle, configured to allow fire to penetrate the grid while maximizing oil drainage.

11. The smokeless barbecue of claim 9, wherein said barbecue grilling rack (350) comprising two

25

SUBSTITUTE SHEET (RULE 26) ears (3504) welded to the right and left ends of the rack facilitating the easy placement and removal of the rack and configured to allow cleaning of both the rack and the burners.

12. The smokeless barbecue of claim 9, wherein said barbecue grilling rack (350) comprising an oil drainage channel (3505) with an internal slope within the channel configured to direct the oil from the rack to a removable drain tank (3506).

13. The smokeless barbecue of claim 9, wherein said barbecue grilling rack (350) comprising a removable drain tank (3506) tank with a convenient handle configured for manual removal, disposal and cleaning of the oil.

14. The smokeless barbecue of claim 1, wherein said barbecue burners (350) comprising flame shields (500' and 500”) configured to reduce to fire drifting upwards due to wind moving upwards during the suction action.

15. The smokeless barbecue of claim 14, wherein said lower flame shield (500") surrounding the burners (500) comprises two diagonally blades welded, configured ensure stable gas flow and protects against the wind's suction force that affects the gas exit from the burners.

16. The smokeless barbecue of claim 14, wherein said upper flame shield (500") surrounding the burners (500) has a U-shaped configured to protect against wind pressure.

17. The smokeless barbecue of claim 1, wherein the at least one preliminary filter (190, 195) is comprised within the downward-flowing portion (200').

18. The smokeless barbecue of claim 1, wherein the granular material (192) comprises an active material selected from a group consisting of carbonate beads, exfoliated vermiculite, perlite or any combination thereof.

19. The smokeless barbecue of claim 1, wherein the granular material (192) comprises an inert material selected from a group consisting of inert beads, pebbles or any combination thereof.

20. The smokeless barbecue of claim 1 , wherein the purification shaft (200) and the first cleaning cassette (190) are configured to have a property selected from a group consisting of the first cleaning cassette (190) is emplaceable in the purification shaft (200), the first cleaning cassette (190) and is removable from the purification shaft (200) or any combination thereof.

21. The smokeless barbecue of claim 1, wherein the first cleaning cassette (190) is configured to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

22. The smokeless barbecue of claim 1, wherein the lowest portion of the purification shaft (200)

26

SUBSTITUTE SHEET (RULE 26) comprises a waste container (210).

23. The smokeless barbecue of claim 22, wherein the waste container (210) and the purification shaft (200) are configured to have a property selected from a group consisting of the waste container (210) is removable from the lowest portion of the purification shaft (200), the waste container (210) is emplaceable in the lowest portion of the purification shaft (200), or any combination thereof.

24. The smokeless barbecue of claim 22, wherein the waste container (210) is configured to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

25. The smokeless barbecue of claim 1, wherein the at least one first filter (180) is selected from a group consisting of a carbon particulate filter, a glass filter or any combination thereof.

26. The smokeless barbecue of claim 1, wherein the at least one second removable filter (170) located at the back side of the smokeless barbecue is selected from a group consisting of an electrostatic filter, a high-efficiency particulate absorbing (HEP A) filter, a glass filter, or any combination thereof.

27. The smokeless barbecue of claim 1, wherein said electrostatic filters (370) comprising a filter casing (3701) and a handle (3702) configure to allow easy removal and cleaning.

28. The smokeless barbecue of claim 27, wherein said electrostatic filters cases (3701) comprise nets (3703) at the top and bottom configured to allow smoke to pass through the filters.

29. The smokeless barbecue of claim 27, wherein said electrostatic filters cases (3701) comprise a small hole (3704) configured to accommodate said electrical pin allowing connection the electrostatic filters to the electrical system.

30. The smokeless barbecue of claim 1, wherein a member of a group consisting of the downward-flowing portion (400'), the first cleaning cassette (390) or any combination thereof comprises at least one baffle (194).

31. The smokeless barbecue of claim 20, wherein the at least one baffle (194) is configured to affect the airflow in a manner selected from a group consisting of reducing linearity of the airflow, inducing turbulence in the airflow, increasing turbulence in the airflow, changing the direction of the airflow, inducing serpentine airflow, and any combination thereof.

32. A method of for reducing smoke and air pollutants in a barbecue (1000) comprising: providing a smokeless barbecue (1000) comprising:

2/

SUBSTITUTE SHEET (RULE 26) a grilling area (120) configured to cook food having a working volume (125) above it, the working volume (125) being at least partly enclosed, with a hood (130) being above the working volume, at least a portion of the hood (130') being fixed to a case (110) of the smokeless barbecue (1000), a dedicated open (220) space at the rear part of the barbecue body being the gas cylinder location; a grill hood connected to a micro switch (1310) that communicates with the blower, configured to controls the suction power, when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal; a unique grilling rack (350) configured to drain all the and preventing fire erupting upwards; the grill burners (500) comprising flame shields (500' and 500") around them configured to significantly reduce the possibility of fire drifting upwards; a purification shaft (200) in fluid communication with the hood (130), the purification shaft (200) having an exit (160) at an upper rear portion of the case (110), the purification shaft (200) having a downward-flowing portion (200') in fluid communication with an upward- flowing portion (200"), air being flowable from the hood (130) through the downwardflowing portion (200'), through the upward-flowing portion (200") and thence through the exit (160); the upward-flowing portion (200') comprising at least one first filter (180) and at least one second filter (170); the purification shaft (200) further comprising at least one preliminary filter (190, 195) upstream of both the at least one first filter (180) and the at least one second filter, said electrostatic filters (170) being removable, the at least one preliminary filter (190, 195) comprising a granular material (192), the at least one preliminary filter (190, 195) selected from a group consisting of a first cleaning cassette (190), a fluidized bed (195) or any combination thereof; and, an air pump (150) in fluid communication with the purification shaft (200), the air pump (150) being downstream of both the at least one first filter (180) and the at least one second filter (170); ensuring the at least one preliminary filter (190, 195) is functional; ensuring the at least one first filter (180) is functional; ensuring the at least one second filter (170) is functional;

28

SUBSTITUTE SHEET (RULE 26) activating the air pump (150); and providing heat to the grilling area (120); thereby the air pump (150) drawing air from the grilling area (120) through the purification shaft (200) and through the exit (160) via the at least one preliminary filter (190, 195), the at least one first filter (180) and the at least one second filter (170); wherein the downward-flowing portion (200') is configured to cool heated air flowing therein; further wherein the at least one preliminary filter (190, 195) is configured such that, the at least one preliminary filter (190, 195) being at ambient temperature, liquid contained therewithin is percolatable to a lowest portion thereof and removable from the lowest portion thereof; further wherein the micro grill hood connected to a micro switch (1310) and communicates with the blower, the unique grilling rack (350), and flame shields (500' and 500") around the grill burners (500), and electrostatic filters (370) are configured to reduce smoke and air pollutants selected from a group consisting of SO2, NOX, CO, CO2 and any combination thereof.

33. The method of according to claim 32, wherein said reducing smoke and said SO2, NOX, CO, CO2 and any combination thereof by at least 75%.

34. The method of according to claim 32, wherein said reducing SO2 by at least 75%.

35. The method of according to claim 32, wherein said reducing NOX by at least 80%.

36. The method of according to claim 32, wherein said reducing CO by at least 90%.

37. The method of according to claim 32, wherein said reducing CO2 by at least 90%.

38. A method of preparing a unitary smokeless barbecue (1000) for cooking comprising: providing the unitary smokeless barbecue (1000) comprising: a housing comprising therewithin: a grilling area (120) configured to cook food having a working volume (125) above it, the working volume (125) being at least partly enclosed, with a hood (130) being above the working volume, at least a portion of the hood (130') being fixed to the housing (110) of the smokeless barbecue (1000); smokeless barbecue (1000), a dedicated open (220) space at the rear part of the barbecue body being the gas cylinder

29

SUBSTITUTE SHEET (RULE 26) location; a grill hood connected to a micro switch (1310) that communicates with the blower, configured to controls the suction power, when the lid is open, the suction power is maximum to prevent contact of the smoke with the user, and when the lid is closed, the motor power is minimal; a unique grilling rack (350) configured to drain all the and preventing fire erupting upwards; the grill burners (500) comprising flame shields (500' and 500") around them configured to significantly reduce the possibility of fire drifting upwards; a purification shaft (200) in fluid communication with the hood (130), the purification shaft (200) having an exit (160) at an upper rear portion of the housing (110), the purification shaft (200) having a downward-flowing portion (200') in fluid communication with an upward-flowing portion (200"), air being flowable from the hood (130) through the downward-flowing portion (200'), through the upward-flowing portion (200") and thence through the exit (160); the upward-flowing portion (200') comprising at least one first filter (180) and at least one second filter (170); the purification shaft (200) further comprising at least one preliminary filter (190, 195) upstream of both the at least one first filter (180) and the at least one second filter (170), the at least one preliminary filter (190, 195) comprising a granular material (192), the at least one preliminary filter (190, 195) selected from a group consisting of a first cleaning cassette (190, 195), a fluidized bed (195) or any combination thereof; and an air pump (150) in fluid communication with the purification shaft (200), the air pump (150) being downstream of both the at least one first filter (180) and the at least one second filter (170); ensuring the at least one preliminary filter (190, 195) is functional; ensuring the at least one first filter (180) is functional; ensuring the at least one second filter (170) is functional; activating the air pump (150); and providing heat to the grilling area (120); thereby the air pump (150) drawing air from the grilling area (120) through the purification shaft (200) and through the exit (160) via the at least one preliminary filter (190, 195), the at

30

SUBSTITUTE SHEET (RULE 26) least one first filter (180) and the at least one second filter (170); wherein the downward-flowing portion (200') is configured to cool heated air flowing therein; further wherein the at least one preliminary filter (190, 195) is configured such that, the at least one preliminary filter (190, 195) being at ambient temperature a, liquid contained therewithin is percolatable to at least one portion thereof and removable from the at least one portion thereof; further wherein the at least one preliminary filter (190) is configured such that, the at least one preliminary filter (190) being at ambient temperature, liquid contained therewithin is percolatable to at least one portion thereof and removable from the at least one portion thereof.

39. The method of claim 32 or 38, additionally comprising a step of providing the at least one preliminary filter (190, 195) comprised within the downward-flowing portion (200').

40. The method of claim 32 or 38, additionally comprising a step of providing the granular material (192) comprising an active material selected from a group consisting of carbonate beads, exfoliated vermiculite, perlite or any combination thereof.

41. The method of claim 32 or 38, additionally comprising a step of providing the granular material (192) comprising an inert material selected from a group consisting of inert beads, pebbles or any combination thereof.

42. The method of claim 32 or 38, additionally comprising a step of providing the purification shaft (200) and the first cleaning cassette (190) having a property selected from a group consisting of the first cleaning cassette (190) is emplaceable in the purification shaft (200), the first cleaning cassette (190) and is removable from the purification shaft (200) or any combination thereof.

43. The method of claim 32 or 38, additionally comprising a step of configuring the first cleaning cassette (190) to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

44. The method of claim 32, additionally comprising a step of providing a lowest portion of the purification shaft (200) comprising a waste container (210).

45. The method of claim 44, additionally comprising a step of providing the waste container (210) and the purification shaft (200) having a property selected from a group consisting of

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SUBSTITUTE SHEET (RULE 26) the waste container (210) is removable from the lowest portion of the purification shaft (200), the waste container (210) is emplaceable in the lowest portion of the purification shaft (200), or any combination thereof.

46. The method of claim 44, additionally comprising a step of configuring the waste container (210) having a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

47. The method of claim 38, additionally comprising a step of providing said at least one portion of the unitary smokeless barbecue (1000) comprising at least one waste container (210).

48. The method of claim 47, additionally comprising a step of providing the waste container (210) and the unitary smokeless barbecue (1000) having a property selected from a group consisting of the at least one waste container (210) is removable from the at least one portion of the unitary smokeless barbecue (3000), the at least one waste container (210) is emplaceable in the at least one portion of the unitary smokeless barbecue (1000), or any combination thereof.

49. The method of claim 47, additionally comprising a step of configuring the at least one waste container (210) to have a property selected from a group consisting of cleanable, emptiable, fillable, replaceable or any combination thereof.

50. The method of claim 32 or 38, additionally comprising a step of selecting the at least one first filter (180) from a group consisting of a carbon particulate filter, a glass filter or any combination thereof.

51. The method of claim 32 or 38, additionally comprising a step of selecting the at least one second filter (170) from a group consisting of an electrostatic filter, a high-efficiency particulate absorbing (HEP A) filter, a glass filter, or any combination thereof.

52. The method of claim 32 or 38, additionally comprising a step of providing a member of a group consisting of the downward-flowing portion (200'), the first cleaning cassette (190) or any combination thereof comprising at least one baffle (194).

53. The method of claim 52, additionally comprising a step of configuring the at least one baffle (194) to affect the airflow in a manner selected from a group consisting of reducing linearity of the airflow, inducing turbulence in the airflow, increasing turbulence in the airflow, changing the direction of the airflow, inducing serpentine airflow, and any combination thereof.

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SUBSTITUTE SHEET (RULE 26)