WO2000008925A1 - Preparation d'une composition phytosanitaire solide - Google Patents
Preparation d'une composition phytosanitaire solide Download PDFInfo
- Publication number
- WO2000008925A1 WO2000008925A1 PCT/FR1999/001987 FR9901987W WO0008925A1 WO 2000008925 A1 WO2000008925 A1 WO 2000008925A1 FR 9901987 W FR9901987 W FR 9901987W WO 0008925 A1 WO0008925 A1 WO 0008925A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aryl
- foaming agent
- alkyl
- suspension
- radicals
- 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.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/12—Powders or granules
- A01N25/14—Powders or granules wettable
Definitions
- the present invention relates to a process for the preparation of phytosanitary compositions in solid form, obtained by grinding and then drying a suspension comprising the active material.
- the subject of the invention is a process using a particular anti-foaming agent, which can be introduced at the time of the preparation of the phytosanitary composition and which is capable of retaining its activity when the latter is used .
- the phytosanitary compositions in addition to the active materials and fillers, contain surfactants, which have, inter alia, the roles of improving the wetting and the dispersion of the compositions during their use.
- surfactants which have, inter alia, the roles of improving the wetting and the dispersion of the compositions during their use.
- these surfactants are the cause of difficulties associated with the production of foam; difficulties encountered, not only during the preparation of these compositions, but also, and above all, during their use.
- the present invention which therefore relates to a process for the preparation of phytosanitary compositions in solid form, in which is carried out grinding a suspension comprising at least one phytosanitary active material, at least one surfactant and at least one anti-foaming agent, followed by drying to obtain the phytosanitary composition in solid form.
- the method according to the invention is characterized in that the grinding is carried out with a suspension comprising at least one anti-foaming agent chosen from silicone substances having a Brookfield viscosity measured at 25 ° C, greater than or equal to 8 Pa.s.
- the anti-foaming agent used in the process according to the invention is therefore chosen from silicone substances, further having a Brookfield viscosity measured at 25 ° C., greater than or equal to 8 Pa.s.
- At least one anti-foaming agent having a Brookfield viscosity measured at 25 ° C., greater than or equal to 10 Pa.s, preferably greater than or equal to 20 Pa, is used. .s.
- the silicone substance (or silicone) is more particularly chosen from polyorganosiloxanes in which at least 50% of the organic substituents are methyl radicals.
- the other radicals of the silicone substance may be hydrogen atoms, hydroxyls, linear or branched C 1 -C 10 alkyl radicals, linear or branched C2-C 10 alkenyl radicals, aryl or alkylaryl radicals in C5-C10.
- silicone substances used correspond to the following formula:
- radicals R 1 identical or different, substituted or not, represent a linear alkyl or branched, in CIC-IO; a C2-C10 linear or branched alkenyl radical; an aryl, alkyl-aryl, aryl-alkyl, aryl-alkenyl, alkenyl-aryl radical, C5-C10 for the aryl part and C1-C4 for the alkyl or alkenyl part, or hydroxyie; - the radicals R2, R3, 4 ) substituted or not, identical or different, represent a linear or branched, C1-C6 alkyl; a C2-C10 linear or branched alkenyl radical; an aryl, alkyl-aryl, aryl-alkyl, aryl-alken
- silicone oils are used for which the radicals R, which are identical or different, represent methyl, ethyl, vinyl, phenyl or hydroxyl radicals.
- the preferred radicals R 1 are methyl, hydroxyl radicals.
- silicones comprising only terminal methyl radicals are suitable, or else silicones having, at each of the ends, a hydroxyl radical and two methyl radicals.
- radicals R 2 , R3, R4, the methyl, ethyl, vinyl and phenyl radicals are preferred. It should be noted that according to a particular embodiment, at least 80% of said radicals are methyls.
- the silicone substance used can be in the form of an oil, or even a compound.
- compound is a conventional term in the field of silicones, and which designates a silicone substance associated with at least one mineral filler.
- Compounds are used whose Brookfield viscosity is greater than or equal to 8 Pa.s, more particularly 10 Pa.s, preferably 20 Pa.s.
- the mineral fillers used to obtain the compounds have a specific surface, measured according to BET methods, of at least
- 50 m 2 / g in particular between 50 and 400 m 2 / g, preferably greater than 70 r ⁇ v7g. They also have an average particle size of less than
- the mineral filler is chosen from silica, ground quartz, calcined clays, or even diatomaceous earths, oxides, hydroxides or sulfates of elements from columns MA, IIIB of the periodic table, mica, gypsum, alone or in mixtures.
- the mineral filler associated with the silicone substance is silica. This can be in precipitated or calcined form.
- the hydrophobation treatment consists in contacting the silica with one or more organosilicon compounds.
- organosilicon compounds such as methylpolysiloxanes such as hexamethyldisiloxane, octamethylcyclotetrasiloxane; methylpolysilazanes such as hexamethyldisilazane, hexamethylcyclot silazane; chlorosilanes such as dimethyldichlorosilane, trimethylchlorosilane, methylvinyldichlorosilane, dimethylvinylchlorosilane; alkoxysilanes such as dimethylmethoxysilane, MQ resins.
- methylpolysiloxanes such as hexamethyldisiloxane, octamethylcyclotetrasiloxane
- methylpolysilazanes such as hexamethyldisilazane, hexamethylcyclo
- the silicas can increase their starting weight up to a rate of 20%.
- a compound is used whose mineral filler is precipitated silica.
- the silica used in the composition of the compound is hydrophobic.
- a particularly advantageous embodiment of the invention consists in using a silicone substance of high viscosity with a filler, and more particularly silica, made very hydrophobic.
- the proportion of silicone with respect to the mineral filler, and more particularly with respect to silica varies between 2 and 15 and preferably between 2 and 10.
- the compounds are prepared in the usual manner by mixing the two components, then heating the mixture obtained between 60 and 200 ° C, in particular around 150 ° C, preferably under reduced pressure.
- the silica undergoes a heat treatment at a temperature above 100 - 150 ° C., in the absence of the aforementioned silicic compounds.
- the anti-foaming agent used in the invention may be in the form of an oil, of a compound. but also an emulsion.
- Such an embodiment is advantageous in the sense that the anti-foaming agent becomes easier to use, since the viscosity of the emulsion is very low, while retaining its advantageous properties because the viscosity of the anti-foaming agent, as such, always remains greater than or equal to 8 Pa.s, preferably greater than or equal to 10 Pa.s, more particularly greater than or equal to 20 Pa.s .
- the continuous medium can be chosen from water or any other compound which does not or substantially does not dissolve the silicone substance.
- silicone compounds in the form of an oil, an emulsion or a compound, commercially available and capable of entering into the composition according to the invention, there may be mentioned, for example, the compound Rhodorsil® 471, sold by the Rhodia company.
- composition according to the invention may comprise one or more silicone substances, as such or combined with one or more mineral fillers.
- the total amount of anti-foaming agent in the phytosanitary composition represents 0.1 to 2% by weight relative to the total weight of the phytosanitary composition in solid form.
- the process according to the invention is suitable for the preparation of phytosanitary compositions in solid form, and more particularly in the form of dispersible granules.
- the term “phytosanitary composition” means any composition intended for applications in the field of agriculture, comprising at least one biologically active material, as are in particular pesticides.
- pesticides we mean among others, herbicides, fungicides, acaricides, insecticides, nematicides. It should be noted that if the method according to the invention can be used for any type of phytosanitary active ingredient, it is nevertheless particularly suitable for solid active ingredients, insoluble or poorly soluble in water.
- suitable active ingredients there may be mentioned, among others, Ametryne, Diuron, Linuron, Chlortoluron, Isoproturon, Nicosulfuron, Metamitron, Diazinon, Glyphosate, Aclonifen, Atrazine, Chlorothalonil,
- Simazine the active products of the imidazolinone series, the organophosphate family, with in particular Azinphos-ethyl, Azinphos-methyl, Alachlore,
- Chlorpyriphos Diclofop-methyl, Fenoxaprop-p-ethyl, Methoxychlor,
- the amount of active material in the solid phytosanitary composition represents more particularly 50 to 95% by weight relative to the total weight of the solid phytosanitary composition.
- the phytosanitary composition comprises at least one surfactant.
- surfactants having mainly a role of wetting agent.
- N-methyl-N-oleoyl taurates N-methyl-N-oleoyl taurates
- alkylarylsulfonate salts such as alkylbenzene sulfonate salts, alkyl diphenyl ether sulfonate salts, alkylnaphthalene sulfonate salts
- ethoxylated alkylphenois N-methyl-N-oleoyl taurates
- alkylarylsulfonate salts such as alkylbenzene sulfonate salts, alkyl diphenyl ether sulfonate salts, alkylnaphthalene sulfonate salts
- mono-alkyl sulfosuccinates di-alkyl sulfosuccinates
- Geropon® SDS Geropon® T / 77
- Supragil® NC / 85 Rhodacal® DS / 10
- Rhodacal® DS / 10 te Supragil® WP, sold by the company Rhodia Chimie.
- the amount of wetting agent may be between 0.5 and 10% by weight, relative to the total weight of the solid phytosanitary composition, preferably between 1 and 5% by weight, relative to the same reference.
- the solid phytosanitary compositions according to the present invention can also comprise at least one surfactant having mainly a role of dispersing agent.
- the alkali metal or ammonium salts of alkylnaphthalene sulfonates condensed with formalin the alkali metal or ammonium salts of 4,4'-dihydroxybiphenyisulfonate condensed with formalin; alkali or ammonium salts of alkylarylphosphates or alkylarylsulfates, such as polyoxyethylenated and / or polyoxypropylenated, phosphated or sulphated, neutralized or not, mono-, di- or tri-styrylphenols; alkali, alkaline earth metal or ammonium lignosulfonates; and their mixtures.
- ammonium has the same following meaning: N (R3) 4 + , with R 3 , identical or different, representing hydrogen atoms, or C1-C4 hydrocarbon radicals.
- the ethylene oxide / propylene oxide copolymers are also compounds which can be used as dispersing agents. Particularly suitable are compounds having a molecular mass of between 3000 and 25000 g / mol.
- alkali metal or ammonium salts of polymers comprising at least one monomer chosen from acids, diacids or unsaturated C3-C5 anhydrides, optionally combined with at least one monomer chosen from hydrocarbon radicals, unsaturated, linear or branched in C4-C8.
- polymers comprising, as monomers, maleic acid, maleic anhydride, acrylic acid, methacrylic acid, alone or in mixtures.
- Said polymers can likewise comprise at least one monomer chosen from pisobutylene or diisobutylene.
- This polymer may be in an acid form or else in the form of an alkali metal or ammonium salt of type N (R3) + , with R3, identical or different, representing hydrogen atoms, or hydrocarbon radicals in C1-C4.
- R3 alkali metal or ammonium salt of type N (R3) +
- R3 identical or different, representing hydrogen atoms, or hydrocarbon radicals in C1-C4.
- the copolymer is in the form of sodium salts.
- a polymer comprising maleic acid and / or maleic anhydride combined (s) with pisobutylene and / or diisobutylene is used.
- alkylbenzene sulfonate salt such as more particularly, alkylbenzene sulfonate, and preferably dodecylbenzene sulfonate, of sodium
- an alkylbenzene sulfonate salt such as more particularly, alkylbenzene sulfonate, and preferably dodecylbenzene sulfonate, of sodium
- the weight ratio of salt to polymer being more particularly 10/90.
- the dispersing agents can be chosen from the following products: Geropon® T / 36, Geropon® TA / 72, Geropon® SC / 213, Supragil® MNS / 90, Supragil® GN, Soprophor® FL, Soprophor® FLK, Soprophor® 4D384.
- the amount of dispersing agent in the solid phytosanitary composition is generally between 2 and 20% by weight, relative to the total weight of the composition, preferably between 2 and 15% by weight, relative to the same reference.
- composition can likewise comprise additives common in the field, such as in particular disintegrating agents, anti-caking agents, binding agents, inert fillers.
- Examples of such compounds that may be mentioned include starch, crosslinked polyvinylpyrrolidones, microcrystalline cellulose, crosslinked sodium carboxymethylcellulose, ammonium or sodium phosphates, sodium carbonate or bicarbonate, sodium acetate, sodium metasilicate, magnesium sulfates, zinc or calcium, magnesium hydroxide, calcium chloride, molecular sieves.
- the total amount of additives of this type if they are present, varies between 0.5 and 40% by weight relative to the total weight of the solid phytosanitary composition, preferably between 1 and 30% by weight relative to the same reference.
- inert fillers which may be used in the phytosanitary compositions according to the invention, mention may be made, without being limited thereto, of soluble or partially soluble starch; bentonite; kaolin; diatomaceous earth; attapulgite; zeolites; carbonate, silicates, of alkaline earth metal (calcium, magnesium in particular); talc; mica; silicon dioxide; silico-aluminates, sulfates of alkali metal, alkaline earth metal or ammonium; the oxides, hydroxides or sulfates of elements in columns MA, IIIB of the periodic table of the elements; carbon black, alone or in mixtures.
- a suspension is prepared comprising at least one active material, at least one surfactant and at least one antifoaming agent as defined above.
- the suspension is an aqueous suspension.
- the amount of water added is more particularly between 20 and 60% by weight relative to the weight of said suspension.
- the preparation of the suspension is done in a conventional manner in the field. Thus, one can put in contact all the products simultaneously.
- the preparation of the suspension is generally carried out at a temperature close to room temperature.
- the second step of the process for preparing the solid phytosanitary composition according to the invention consists in grinding the suspension, so as to obtain an appropriate particle size distribution of the particles forming the suspension.
- the grinding is carried out until an average particle size of the order of 1 to 10 ⁇ m is obtained, preferably close to 1 to 4 ⁇ m.
- the grinding operation takes place in any suitable type of equipment, such as in ball mills. It should be noted, and this represents a very important advantage of the present invention, that it is no longer necessary to add an anti-foaming agent once the grinding has been carried out.
- the suspension obtained is then dried.
- Drying takes place using conventional means. However, preferably, said drying takes place by atomization, that is to say by spraying the suspension in a hot atmosphere (spray-drying). This warm atmosphere is advantageously on par.
- the atomization can be carried out by means of any sprayer known per se, for example by a spray nozzle of the sprinkler apple type or the like.
- the gas inlet temperature during drying is between 130 and 250 ° C.
- the temperature to which the active material is subjected during drying remains below the degradation temperature of said active material.
- the solid phytosanitary composition according to the invention is obtained. It conventionally has an average particle size of the order of 400 ⁇ m.
- the solid phytosanitary composition obtained according to the process according to the invention more particularly in the form of a dispersible granule, has low foaming properties, when it is diluted or dispersed at the time of its use.
- compositions are prepared:
- the mixture demixes quickly (brown liquid, beige solid).
- Minimotormill grinding is then carried out (grinder comprising 190 ml of glass beads (diameter 0.8-1.2 mm)).
- One grinding is carried out at 1500 rpm and three grindings at 2000 rpm.
- Atomizer inlet temperature 145 ° C
- Atomizer outlet temperature 135 ° C
- Nozzle air flow 900 l / h
- Nozzle air pressure 0.2 bar
- a composition is obtained in the form of granules.
- Part of the powder obtained previously was treated for 15 days at 54 ° C (simulation of storage conditions).
- the foam persistence test was carried out as follows, with water
- composition has a significant defoaming activity, compared to the comparative compositions.
- composition is stable after aging and the defoaming effect is retained.
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- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Agronomy & Crop Science (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99936733A EP1104234A1 (fr) | 1998-08-14 | 1999-08-13 | Preparation d'une composition phytosanitaire solide |
| AU51725/99A AU5172599A (en) | 1998-08-14 | 1999-08-13 | Method for preparing a solid phytosanitary composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR98/10433 | 1998-08-14 | ||
| FR9810433A FR2782243B1 (fr) | 1998-08-14 | 1998-08-14 | Preparation d'une composition phytosanitaire solide par atomisation en presence d'un agent anti-mousse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000008925A1 true WO2000008925A1 (fr) | 2000-02-24 |
Family
ID=9529690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1999/001987 Ceased WO2000008925A1 (fr) | 1998-08-14 | 1999-08-13 | Preparation d'une composition phytosanitaire solide |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1104234A1 (fr) |
| AU (1) | AU5172599A (fr) |
| FR (1) | FR2782243B1 (fr) |
| WO (1) | WO2000008925A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117580A3 (fr) * | 2004-06-01 | 2006-04-27 | Bayer Cropscience Gmbh | Formulations aqueuses faiblement moussantes pour la protection phytosanitaire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413267A1 (fr) * | 1989-08-14 | 1991-02-20 | Hoechst Schering AgrEvo GmbH | Granulés dispersibles dans l'eau |
| US5364832A (en) * | 1990-08-10 | 1994-11-15 | Hoechst Aktiengesellschaft | Water-dispersible granules comprising fenoxaprop-ethyl and/or fenchlorazole |
-
1998
- 1998-08-14 FR FR9810433A patent/FR2782243B1/fr not_active Expired - Fee Related
-
1999
- 1999-08-13 EP EP99936733A patent/EP1104234A1/fr not_active Withdrawn
- 1999-08-13 AU AU51725/99A patent/AU5172599A/en not_active Abandoned
- 1999-08-13 WO PCT/FR1999/001987 patent/WO2000008925A1/fr not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413267A1 (fr) * | 1989-08-14 | 1991-02-20 | Hoechst Schering AgrEvo GmbH | Granulés dispersibles dans l'eau |
| US5364832A (en) * | 1990-08-10 | 1994-11-15 | Hoechst Aktiengesellschaft | Water-dispersible granules comprising fenoxaprop-ethyl and/or fenchlorazole |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117580A3 (fr) * | 2004-06-01 | 2006-04-27 | Bayer Cropscience Gmbh | Formulations aqueuses faiblement moussantes pour la protection phytosanitaire |
| EA013210B1 (ru) * | 2004-06-01 | 2010-04-30 | Байер Кропсайенс Аг | Жидкая водная гербицидная композиция, способ ее получения и способ борьбы с нежелательным ростом растений |
| US8901041B2 (en) | 2004-06-01 | 2014-12-02 | Bayer Intellectual Property Gmbh | Low-foam aqueous formulations for crop protection |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2782243B1 (fr) | 2001-08-17 |
| EP1104234A1 (fr) | 2001-06-06 |
| AU5172599A (en) | 2000-03-06 |
| FR2782243A1 (fr) | 2000-02-18 |
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