EP4368318A1 - Dispositif et procédé pour réduire un courant de fusion au moyen d'un gaz d'échappement - Google Patents
Dispositif et procédé pour réduire un courant de fusion au moyen d'un gaz d'échappement Download PDFInfo
- Publication number
- EP4368318A1 EP4368318A1 EP23208217.2A EP23208217A EP4368318A1 EP 4368318 A1 EP4368318 A1 EP 4368318A1 EP 23208217 A EP23208217 A EP 23208217A EP 4368318 A1 EP4368318 A1 EP 4368318A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- atomizing
- melting
- atomization
- induction coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000155 melt Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000000889 atomisation Methods 0.000 claims abstract description 29
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 20
- 230000006698 induction Effects 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000000289 melt material Substances 0.000 claims abstract 2
- 239000002245 particle Substances 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000005192 partition Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000007789 gas Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0836—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with electric or magnetic field or induction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0892—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting nozzle; controlling metal stream in or after the casting nozzle
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/047—Making non-ferrous alloys by powder metallurgy comprising intermetallic compounds
Definitions
- the invention relates to a device for atomizing a metallic, intermetallic or ceramic melt stream by means of an atomizing gas to form a spherical powder with the features specified in the preamble of patent claim 1.
- the invention further relates to a method for atomizing a corresponding melt stream to form a spherical powder.
- the invention is based on the object of developing a generic atomization device in such a way that an effective atomization takes place which is particularly suitable for achieving smaller particle sizes.
- an atomizing nozzle with an exclusively divergent nozzle profile has an opening angle of at least 5°, in particular at least 10°, in particular at least 20°, in particular at least 30°, and/or a maximum of 90°, in particular a maximum of 75°, in particular a maximum of 60°.
- a corresponding opening angle is present at least in sections along the thickness direction, in particular over at least 50% of the thickness, in particular over the entire thickness, of the nozzle plate and/or the aperture.
- turbulence occurs in the atomizing gas flow both before and after the nozzle without the formation of a laminar flow, which is surprisingly beneficial for the production of spherical powders with very small particle diameters.
- a laminar flow along the divergent flank of the orifice can only develop up to an opening angle of less than 5° of the nozzle. At a larger opening angle, the flow breaks off. This flow separation and the associated turbulence occurs, depending on the specific edge formation, immediately after the gas enters the nozzle.
- the invention is further based on the object of developing a generic atomization method in such a way that an effective atomization takes place which is particularly suitable for achieving smaller particle sizes.
- the main components of the atomization device shown in the drawing are a melting chamber 1, an atomization chamber 2 (also called a powder chamber), an induction coil 3 arranged in the melting chamber 1 and a nozzle plate 4 arranged between the two chambers 1, 2, in which an atomization nozzle 5, which can be formed in the nozzle plate 4 or in a separate aperture 11, serves to connect these two chambers 1, 2.
- the rotationally symmetrical aperture 11 sits in a corresponding receptacle 12 in the nozzle plate 4 with an orientation that the center M of the atomization nozzle 5 lies in the axis of symmetry of the induction coil 3.
- the nozzle plate 4 is flat and aligned perpendicular to the flow direction of a melt stream 8.
- the material to be atomized is introduced in the form of a nozzle with a tip 6 (tip angle 30° to 60°) is partially introduced into the conical induction coil 3 with three turns, as is basically possible, for example, from the EN 41 02 101 A1 is known.
- the conicity of the induction coil 3 corresponds to the conicity of the tip 6 of the rod 7 to be sprayed. Induction coils with other numbers of turns, such as two turns, and different conicities of the coil and rod tip are possible.
- the tip 6 and in particular the surface of the tip 6 is inductively heated by medium-frequency current flowing through the induction coil 3 until a molten phase is formed on the surface.
- This melt stream 8 runs downwards along the conical surface and preferably drips from the tip 6 in the form of a continuous pouring jet.
- the mass flow of the pouring jet forming the melt stream 8 can preferably be varied via the inductively coupled electrical power in a wide range between 0.4 kg/min and 3 kg/min.
- a melt flow between 0.6 and 2.5 kg/min is considered particularly suitable for atomization.
- the rod 7 preferably rotates slowly around its axis of symmetry S and/or moves continuously downwards.
- the respective melting rate is determined from the diameter DS of the rod 7, which can be between 30 and 200 mm, and the set lowering speed.
- Rod diameters DS between 40 and 150 mm have proven to be particularly favorable in terms of process technology.
- the height adjustment of the induction coil 3 is preferably achieved by means of a linear suspension 9, which is only shown schematically in the drawing. This allows the free fall height of the pouring jet to the nozzle and thus, as mentioned above, the viscosity of the melt when entering the nozzle to be varied. This is because the melt temperature decreases with increasing fall height, particularly due to the emission of radiation power, which changes the viscosity of the melt when entering the nozzle and thus the resulting particle size distribution can be controlled in a targeted manner.
- Horizontal coil windings have also proven to be particularly advantageous, as they prevent the pouring stream from being deflected by electromagnetic forces when it leaves the coil's magnetic field, in contrast to rising coil windings.
- a certain degree of superheating of the melt can be achieved by placing the edge of the cone at a distance from the topmost turn, thus allowing the melt to fall through the induction field for longer.
- Distances between 3 mm and 50 mm have proven to be advantageous for reactive, high-melting metals and rods with a diameter of > 115 mm.
- the rotationally symmetrical atomizing nozzle 5 is located with its center in the symmetry axis S of rod 7 and coil 3 at the distance H below the lowest winding in the induction coil 3.
- the melt jet is radially surrounded by the gas flowing from the melting chamber 1 into the atomization chamber 2 used for atomization.
- the acceleration of the gas due to the falling pressure after the orifice 11 introduces tensions into the melt jet, causing it to atomize.
- the driving force for this is the positive pressure difference between the gas pressure P1 in the melting chamber 1 and the gas pressure P2 in the atomization chamber 2.
- This pressure difference is at least 0.2 bar, at most 25 bar.
- Technically particularly advantageous pressure differences are in the range between 3 bar and 21 bar.
- the atomizing gas accelerated by the pressure drop causes pressure and shear stresses on the outer skin of the melt jet.
- the melt velocity in the melt jet increases radially from the outside inwards.
- these pressure and shear stresses are instantly reduced by the melt jet filament breaking up into individual droplets, which solidify into spherical powder particles in the atomization chamber 2.
- the turbulences caused before and after the aperture 11 significantly support the atomization function, so that even very fine spherical powders can be produced with high yields.
- This process enables lower specific Ar consumption to be achieved because the pressure in the melting chamber can be maintained at lower flow rates.
- the lower outflow velocity after orifice 11 which is always below the speed of sound, improves the powder quality, particularly with regard to satellite formation.
- the outer diameter ⁇ A of the circular aperture 11 with the centrally arranged atomizing nozzle 5 is, for example, 60 mm to 100 mm, preferably 80 mm and the diameter ⁇ B of the inlet-side nozzle opening 13 is 5 mm to 18 mm, preferably 7 mm.
- the diameter ⁇ C of the outlet-side nozzle opening 14 of the atomizing nozzle 5 is between 10 mm and 30 mm, preferably 20 mm.
- the thickness d of the aperture 11 is 3 mm to 10 mm, preferably 4.5 mm.
- the aperture 11 shown has a divergent atomizing nozzle 5, the nozzle flank 15 of which has a cross-sectionally partially circular divergence profile, wherein the thickness d of the aperture 11 is smaller than the divergence partial circle radius Rz of the nozzle flank 15.
- the divergent atomizing nozzle 5 is provided with a nozzle flank 15 which has an internally conical divergence profile.
- the opening angle W is particularly preferably between 5° and 90°, in particular between 30° and 60°, preferably about 55°.
- the aperture 11 shown corresponds essentially to the embodiment according to Fig.4 , as far as the basic design as an internally conical atomizing nozzle 5 is concerned.
- this aperture 11 has a cross-sectionally partially circular rounding 18 with a small radius Rx in the area of the inlet-side nozzle opening 13 at the transition to the upper side 16 of the aperture 11.
- the angle ⁇ which is enclosed by the circle tangent at the intersection with the upper side 16 and the upper side 16 itself, can be between 90° and 150°.
- the angle ⁇ in this embodiment corresponds to the cone angle (90° - W).
- the atomizing nozzle 5 in Fig.6 is analogous to the embodiment according to Figure 5 at the inlet-side nozzle opening 13 is again provided with a small curve 18 with a radius Rx.
- the outlet-side nozzle opening 14 there is a similar curve 18 with a radius Ry.
- the angle ⁇ which the circle tangent to the curve 18 makes on the Intersection with the bottom side 17 and the bottom side 17 itself, between 0 and 60°.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022211865.0A DE102022211865A1 (de) | 2022-11-09 | 2022-11-09 | Vorrichtung zur Verdüsung eines Schmelzstromes mittels eines Verdüsungsgases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4368318A1 true EP4368318A1 (fr) | 2024-05-15 |
Family
ID=88731537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23208217.2A Pending EP4368318A1 (fr) | 2022-11-09 | 2023-11-07 | Dispositif et procédé pour réduire un courant de fusion au moyen d'un gaz d'échappement |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4368318A1 (fr) |
| DE (1) | DE102022211865A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022211865A1 (de) | 2022-11-09 | 2024-05-16 | Gfe Metalle Und Materialien Gmbh | Vorrichtung zur Verdüsung eines Schmelzstromes mittels eines Verdüsungsgases |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4863509A (en) * | 1986-09-16 | 1989-09-05 | Centrem S.A. | Method and apparatus for producing and further processing metallic substances |
| DE4102101A1 (de) | 1991-01-25 | 1992-07-30 | Leybold Ag | Einrichtung zum herstellen von pulvern aus metallen |
| WO2015092008A1 (fr) | 2013-12-20 | 2015-06-25 | Nanoval Gmbh & Co. Kg | Dispositif et procédé de fusion en zone flottante d'un matériau et d'atomisation du matériau fondu pour fabriquer de la poudre |
| WO2019118723A1 (fr) * | 2017-12-14 | 2019-06-20 | Arconic Inc. | Procédé et appareil de fusion et de solidification de métal à haute pression |
| DE102019214555A1 (de) | 2019-09-24 | 2021-03-25 | Ald Vacuum Technologies Gmbh | Vorrichtung zur Verdüsung eines Schmelzstromes mittels eines Gases |
| CN113857484A (zh) * | 2020-06-30 | 2021-12-31 | 航天海鹰(哈尔滨)钛业有限公司 | 一种减少卫星粉的气雾化制粉装置 |
| DE102022211865A1 (de) | 2022-11-09 | 2024-05-16 | Gfe Metalle Und Materialien Gmbh | Vorrichtung zur Verdüsung eines Schmelzstromes mittels eines Verdüsungsgases |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3311343C2 (de) | 1983-03-29 | 1987-04-23 | Alfred Prof. Dipl.-Ing.Dr.-Ing. 7830 Emmendingen Walz | Verfahren zur Herstellung von feinen Metallpulvern sowie Vorrichtung zur Durchführung des Verfahrens |
-
2022
- 2022-11-09 DE DE102022211865.0A patent/DE102022211865A1/de active Pending
-
2023
- 2023-11-07 EP EP23208217.2A patent/EP4368318A1/fr active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4863509A (en) * | 1986-09-16 | 1989-09-05 | Centrem S.A. | Method and apparatus for producing and further processing metallic substances |
| DE4102101A1 (de) | 1991-01-25 | 1992-07-30 | Leybold Ag | Einrichtung zum herstellen von pulvern aus metallen |
| WO2015092008A1 (fr) | 2013-12-20 | 2015-06-25 | Nanoval Gmbh & Co. Kg | Dispositif et procédé de fusion en zone flottante d'un matériau et d'atomisation du matériau fondu pour fabriquer de la poudre |
| WO2019118723A1 (fr) * | 2017-12-14 | 2019-06-20 | Arconic Inc. | Procédé et appareil de fusion et de solidification de métal à haute pression |
| DE102019214555A1 (de) | 2019-09-24 | 2021-03-25 | Ald Vacuum Technologies Gmbh | Vorrichtung zur Verdüsung eines Schmelzstromes mittels eines Gases |
| US20220339701A1 (en) * | 2019-09-24 | 2022-10-27 | Ald Vacuum Technologies Gmbh | Device for atomizing a melt stream by means of a gas |
| CN113857484A (zh) * | 2020-06-30 | 2021-12-31 | 航天海鹰(哈尔滨)钛业有限公司 | 一种减少卫星粉的气雾化制粉装置 |
| DE102022211865A1 (de) | 2022-11-09 | 2024-05-16 | Gfe Metalle Und Materialien Gmbh | Vorrichtung zur Verdüsung eines Schmelzstromes mittels eines Verdüsungsgases |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022211865A1 (de) | 2024-05-16 |
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