WO2004038057A2 - Procede de traitement de tole avant galvanisation - Google Patents
Procede de traitement de tole avant galvanisation Download PDFInfo
- Publication number
- WO2004038057A2 WO2004038057A2 PCT/FR2003/050085 FR0350085W WO2004038057A2 WO 2004038057 A2 WO2004038057 A2 WO 2004038057A2 FR 0350085 W FR0350085 W FR 0350085W WO 2004038057 A2 WO2004038057 A2 WO 2004038057A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oxygen
- vol
- flame
- burner
- oxidant
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 title description 8
- 239000002184 metal Substances 0.000 title description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000007800 oxidant agent Substances 0.000 claims abstract description 19
- 230000001590 oxidative effect Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 230000008030 elimination Effects 0.000 claims abstract description 6
- 238000003379 elimination reaction Methods 0.000 claims abstract description 6
- 238000005246 galvanizing Methods 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000003517 fume Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000567 combustion gas Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical group O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract 1
- 238000009841 combustion method Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 239000011701 zinc Substances 0.000 description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000004532 chromating Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
Definitions
- the present invention relates to a method for increasing the kinetics of elimination of oil-type products deposited on the surface of a metallurgical product passing through an area of an oven at a temperature above 500 ° C., in which at least part of the thermal energy is provided using at least one burner supplied with oxidant and fuel.
- It relates more particularly to the pretreatment of steel sheets before galvanization.
- such a process consists in covering a sheet, piece or steel wire with a layer of zinc or zinc alloy.
- the thin layer is obtained by immersing the product in a bath of molten zinc at 450 ° C. At this temperature, multi-layer alloys (Fe / Zn) are formed which constitute a tight corrosion barrier.
- multi-layer alloys Fe / Zn
- the interface between the metal support and the zinc layer thus deposited will consist of different layers of Zn / Fe alloy. Any oxide impurity will be a source of mechanical and chemical embrittlement and will induce a weak point in the protection of the metal, which should absolutely be avoided by a good quality galvanizing treatment.
- Hot Dip comprises five phases of hot galvanizing (on a continuous line) which can be summarized as follows:
- Phase 1 direct preheating of the load in an oven
- Phase 4 galvanization in a zinc bath
- Phase 5 surface treatment (chromating, painting, etc.)
- the following is carried out: the total reduction of oxides under controlled reducing atmospheres, of the nitrogen-hydrogen type for example with a controlled dew point, the annealing of the steel product to eliminate the stresses and enlarge the grain of the joint so achieve the desired crystallographic properties of the product.
- Phase 5 During this last phase, the surface treatment of the product is carried out according to the specifications of the end customer, such as, for example, a chromating, miniflowering, rolling and / or painting treatment.
- the products when entering the galvanizing line have very different surface characteristics depending on the nature and composition of the metal from one product coil to another (even if it is always steel).
- the steel sheet coils can have different origins, different grades of steel composing the metal, have been rolled on different rolling mills, have been rolled in the presence of different types of rolling oils, have known times and conditions of different storage, etc. All of these coils have one characteristic in common, however: the presence of oil on the surface of the sheet, oil necessary for carrying out the rolling which precedes this galvanizing treatment, with however possibly very significant differences in the nature of the oils used and in the quantities remaining on the surface of the sheet.
- the surface of it must of course be cleaned, pickled and surface oxides eliminated to allow obtaining a surface condition suitable for galvanizing said product and obtaining a layer having as few defects as possible.
- the removal of oils from the surface of the product, in particular from a sheet is carried out thermally: the sheet is introduced into an oven, in which the pyrolysis of the oils on the surface and the cracking of the molecules are carried out. oil thus pyrolyzed.
- the oils on the surface of the product are organic products of the Cn Hm type (with m> n)
- the Cn Hm molecules thus cracked react with the water vapor present in the atmosphere according to the reaction:
- the concentration of water vapor in the oven by injection of water spray which is quickly brought to the temperature of the oven in the zone of pyrolysis, or a temperature between 900 ° C and 1300 ° C approximately.
- the first drawback consists in the need to consume part of the energy of the oven to bring the water from room temperature to the temperature indicated above.
- the second drawback is the creation of cold spots locally in the oven and the corresponding drop in oven temperature.
- this drop in temperature causes a reduction in the kinetics of the oxidation reaction of the cracked products and therefore generates a possible deposit of soot resulting from the presence of non-oxidized carbon.
- the method according to the invention makes it possible to solve the problem thus posed.
- the oxidizer used by at least one of the burners comprises more than 21% vol. oxygen, so as to increase the concentration of water vapor in the flame thus generated compared to the concentration of water vapor generated by the same combustion process which would use an oxidizer containing at most 21% vol. oxygen, all other things being equal.
- the invention is characterized in that the flame generated by at least one burner contains more than 20% of water vapor by volume.
- oxygen or air enriched with oxygen will be used as oxidant, so as to obtain more than 20% vol. water vapor in the flame.
- the flame has a temperature above 1500 ° C.
- the flame will contain more than 40% vol. water vapor.
- the flame will be super-stoichiometric (by oxidizing) - that is to say containing more oxidant than necessary by a stoichiometric oxidant / fuel reaction -, thus generating a mixture of combustion gas at the burner outlet containing at most 10% oxygen.
- the fumes leaving the oven will contain at most 5% vol. oxygen.
- the method according to the invention applies more particularly to the treatment of a steel sheet, this sheet then being subjected to a galvanizing step.
- the product processing atmosphere in the oven contains more than 20% vol. water vapor, at least in one area of the oven, the kinetics of elimination of the oils present on the surface of said product would be increased.
- the atmosphere in the vicinity of the sheet contains in particular carbon monoxide and carbon dioxide, the sum of the volumes of which is approximately 10% vol., water vapor and hydrogen in total quantity for all of the two, equal to 20% vol.
- the temperature of the oven is controlled so that has this remains in the same temperature range with however a total amount of CO plus C0 2 which varies according to the zone of the oven or its temperature of 11% vol. at 33% vol. and a total amount of H 2 0 and H 2 which varies from 21% to 66% vol.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003292355A AU2003292355A1 (en) | 2002-10-23 | 2003-10-10 | Method of treating sheet metal before galvanisation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0213242A FR2846341B1 (fr) | 2002-10-23 | 2002-10-23 | Procede de traitement de tole avant galvanisation |
FR02/13242 | 2002-10-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004038057A2 true WO2004038057A2 (fr) | 2004-05-06 |
WO2004038057A3 WO2004038057A3 (fr) | 2004-07-22 |
Family
ID=32088208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/050085 WO2004038057A2 (fr) | 2002-10-23 | 2003-10-10 | Procede de traitement de tole avant galvanisation |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2003292355A1 (fr) |
FR (1) | FR2846341B1 (fr) |
WO (1) | WO2004038057A2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3109344A1 (fr) * | 2015-06-25 | 2016-12-28 | Linde Aktiengesellschaft | Procédé pour dégraisser un film/une feuille métallique et ajuster la taille des grains |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE527771C2 (sv) | 2004-10-29 | 2006-05-30 | Aga Ab | Förfarande vid tillverkning av långsträckta stålprodukter |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1864257A (en) * | 1930-05-31 | 1932-06-21 | Bostwick Steel Lath Company | Means for removing lubricating compound from perforated sheet metal |
US2288980A (en) * | 1941-10-30 | 1942-07-07 | Gen Properties Company Inc | Method of cleaning metals |
FR919857A (fr) * | 1946-01-08 | 1947-03-20 | Traitements Applic Et Rech S T | Procédé de traitement de pièces métalliques en vue de toute opération de revêtement et notamment pour l'émaillage |
US2625495A (en) * | 1948-06-04 | 1953-01-13 | Surface Combustion Corp | High-temperature cleaning of ferrous metal |
US3052014A (en) * | 1958-04-21 | 1962-09-04 | Aluminum Co Of America | Flame treatment of aluminum |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0211784A (ja) * | 1988-06-29 | 1990-01-16 | Nippon Steel Corp | 鋼伸線材の表面清浄処理方法 |
JP2663090B2 (ja) * | 1993-02-25 | 1997-10-15 | 昭和アルミニウム株式会社 | 金属条用フレーム処理装置及び処理方法 |
-
2002
- 2002-10-23 FR FR0213242A patent/FR2846341B1/fr not_active Expired - Fee Related
-
2003
- 2003-10-10 WO PCT/FR2003/050085 patent/WO2004038057A2/fr not_active Application Discontinuation
- 2003-10-10 AU AU2003292355A patent/AU2003292355A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1864257A (en) * | 1930-05-31 | 1932-06-21 | Bostwick Steel Lath Company | Means for removing lubricating compound from perforated sheet metal |
US2288980A (en) * | 1941-10-30 | 1942-07-07 | Gen Properties Company Inc | Method of cleaning metals |
FR919857A (fr) * | 1946-01-08 | 1947-03-20 | Traitements Applic Et Rech S T | Procédé de traitement de pièces métalliques en vue de toute opération de revêtement et notamment pour l'émaillage |
US2625495A (en) * | 1948-06-04 | 1953-01-13 | Surface Combustion Corp | High-temperature cleaning of ferrous metal |
US3052014A (en) * | 1958-04-21 | 1962-09-04 | Aluminum Co Of America | Flame treatment of aluminum |
Non-Patent Citations (3)
Title |
---|
"CHEMICAL ABSTRACTS + INDEXES, AMERICAN CHEMICAL SOCIETY. COLUMBUS, US" CHEMICAL ABSTRACTS + INDEXES, AMERICAN CHEMICAL SOCIETY. COLUMBUS, US, vol. 113, no. 26, 2 juillet 1990 (1990-07-02), page 242, XP000192617 ISSN: 0009-2258 & JP 02 011784 A (NIPPON STEEL) 16 janvier 1990 (1990-01-16) * |
BECKER W. W.: "Flame cleaning iron and steel" MATERIALS PERFORMANCE., vol. 6, no. 7, 1 juillet 1967 (1967-07-01), pages 36-37, XP002248242 NACE. HOUSTON., US ISSN: 0094-1492 * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 647 (C-1283), 8 décembre 1994 (1994-12-08) -& JP 06 248358 A (SHOWA ALUM CORP), 6 septembre 1994 (1994-09-06) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3109344A1 (fr) * | 2015-06-25 | 2016-12-28 | Linde Aktiengesellschaft | Procédé pour dégraisser un film/une feuille métallique et ajuster la taille des grains |
WO2016206799A1 (fr) * | 2015-06-25 | 2016-12-29 | Linde Aktiengesellschaft | Procédé permettant de dégraisser une feuille/tôle métallique et de régler la grosseur de grain |
Also Published As
Publication number | Publication date |
---|---|
FR2846341A1 (fr) | 2004-04-30 |
FR2846341B1 (fr) | 2006-07-28 |
AU2003292355A8 (en) | 2004-05-13 |
AU2003292355A1 (en) | 2004-05-13 |
WO2004038057A3 (fr) | 2004-07-22 |
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