EP0064790A1 - Procédé pour la phosphatation de métaux ainsi que son utilisation pour le prétraitement pour la peinture électrique au trempé - Google Patents
Procédé pour la phosphatation de métaux ainsi que son utilisation pour le prétraitement pour la peinture électrique au trempé Download PDFInfo
- Publication number
- EP0064790A1 EP0064790A1 EP82200514A EP82200514A EP0064790A1 EP 0064790 A1 EP0064790 A1 EP 0064790A1 EP 82200514 A EP82200514 A EP 82200514A EP 82200514 A EP82200514 A EP 82200514A EP 0064790 A1 EP0064790 A1 EP 0064790A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- phosphating
- zinc
- metal surfaces
- zinc phosphate
- phosphate solutions
- 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
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/36—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
- C23C22/362—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing also zinc cations
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
Definitions
- the invention relates to a method for phosphating.
- Metals especially iron, steel and zinc, with acidic, aqueous oxidizing agent-containing zinc phosphate solutions and its use for pretreating the metal surfaces for electrocoating.
- DE-OS 25 38 347 describes acidic aqueous phosphating solutions which contain at least 0.5% phosphate ions and at least 0.03% Zn and in which the molar weight ratio of phosphate ions to nitrate ions is about 1: (0.7 to 1.3) and the molar weight ratio of zinc ions to phosphate ions is less than 0.116: 1 (converted to weight ratio Zn: P 2 O 5 ⁇ 0.107: 1).
- the object of the invention is to provide a method which does not have the disadvantages of the known methods and which also provides uniform, very corrosion-resistant phosphate layers over large throughputs.
- the object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that the metal surfaces are brought into contact with zinc phosphate solutions which contain, in which the weight ratio of Zn to P 2 O 5 is set to a value of (0.012 to 0.12): 1 and of Ni to Zn to a value of (0 to 1.5): 1 and which is set with Zn , N i and P 2 0 5 in a weight ratio of (0.18 to 0.33): (0 to 0.06): l can be added.
- the method according to the invention is intended in particular for the treatment of iron, steel and zinc. However, it is also suitable for the phosphating of aluminum.
- the metal surfaces can be treated by spraying, flooding and also immersion. However, it is also possible with combined working methods, e.g. Syringes - Diving - Syringes, Syringes - Diving, Dip-Spraying and the like are applicable.
- the contact times for the phosphating solution with the metal surface are in the usual range and can e.g. for spraying 75 seconds to 3 minutes, for diving 2 to 5 minutes and for spraying - diving 20 seconds spraying, 3 minutes diving.
- the bath temperatures are usually between 30 and 65 ° C.
- nickel is particularly beneficial in the treatment of zinc surfaces. But also with steel it often leads to an improvement in the layer quality.
- the solutions can also contain other cations, for example calcium, copper, manganese, cobalt, magnesium. Usually, however, their content does not exceed 0.5 g / l.
- concentration of divalent iron in the bath is kept low by the use of oxidizing agents that oxidize iron (II) to iron (III) and is usually not more than 50 to 100 mg / l. Divalent iron is often not present at all.
- Iron (III) is normally in the concentration given by the low solubility of iron (III) phosphate. tration present, which can be between 3 and 40 mg / 1 Fe (III) depending on the particular bath composition.
- cations from the alkali metal and / or ammonium group are still present.
- the baths used in the process according to the invention contain one or more oxidizing agents which are capable of oxidizing divalent to trivalent iron.
- oxidizing agents which are capable of oxidizing divalent to trivalent iron.
- Favorable results are achieved, for example, with the following additives: 2 to 25 g / l NO 3 ; 1 to 6 g / l C10 3 ; 0.1 to 2 g / 1 organic nitro compounds, for example Na-m-nitrobenzenesulfonate; 0.05 to 0.5 g / l alkali nitrite; 0.02 to 0.1 g / 1 H 2 0 2 .
- the layer formation can be improved by adding simple and / or complex fluorides.
- solutions for reducing the phosphate layer weight may contain compounds known per se, such as hydroxycarboxylic acids (e.g. tartaric acid, citric acid), polyphosphates (e.g. tripolyphosphate, hexametaphosphate).
- hydroxycarboxylic acids e.g. tartaric acid, citric acid
- polyphosphates e.g. tripolyphosphate, hexametaphosphate
- the cations and anions in the phosphating bath must be present in such a proportion that the acidity of the bath is in or near the phosphating equilibrium.
- the weight per unit area of the phosphate layers produced by the process according to the invention is generally in the range between 0.8 and 5 g / m 2 .
- activating agents eg based on titanium phosphate, in the pre-rinse bath or in the last cleaning stage is recommended.
- the phosphate layers produced with the method according to the invention are suitable in principle for all types of application phosphate layers known until today.
- the layers result in an unusually strong improvement in the resistance of the coating film against infiltration under corrosive stress as well as a significant increase in the paint adhesion to the metallic substrate.
- the baths When supplemented with the specified concentrates according to Examples 1 to 4, the baths could be kept in the optimal range practically indefinitely. The layer formation was flawless in all cases. In the nitrite-containing baths, it was only necessary to add the nitrite accelerator in a manner known per se. From time to time, a little sodium hydroxide solution had to be added to bath 4 in order to keep the free acid at the desired value.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813118375 DE3118375A1 (de) | 1981-05-09 | 1981-05-09 | Verfahren zur phosphatierung von metallen sowie dessen anwendung zur vorbehandlung fuer die elektrotauchlackierung |
DE3118375 | 1981-05-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0064790A1 true EP0064790A1 (fr) | 1982-11-17 |
Family
ID=6131837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82200514A Ceased EP0064790A1 (fr) | 1981-05-09 | 1982-05-01 | Procédé pour la phosphatation de métaux ainsi que son utilisation pour le prétraitement pour la peinture électrique au trempé |
Country Status (12)
Country | Link |
---|---|
US (1) | US4419199A (fr) |
EP (1) | EP0064790A1 (fr) |
JP (1) | JPS6056429B2 (fr) |
AU (1) | AU527375B2 (fr) |
BR (1) | BR8202637A (fr) |
CA (1) | CA1200470A (fr) |
DE (1) | DE3118375A1 (fr) |
ES (1) | ES8302794A1 (fr) |
GB (1) | GB2098242B (fr) |
MX (1) | MX159701A (fr) |
PT (1) | PT74827B (fr) |
ZA (1) | ZA822715B (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2512840A1 (fr) * | 1981-09-17 | 1983-03-18 | Amchem Prod | Solutions aqueuses acides pour revetements de phosphate de zinc et leurs concentres, procedes de revetement les mettant en oeuvre et solutions d'activation du metal utilisables dans ces procedes |
EP0141341A1 (fr) * | 1983-10-26 | 1985-05-15 | Metallgesellschaft Ag | Procédé pour la formation de revêtements de phosphate |
EP0261597A2 (fr) * | 1986-09-26 | 1988-03-30 | Ppg Industries, Inc. | Procédé pour appliquer un revêtement au phosphate de zinc et de nickel |
GB2196024A (en) * | 1986-09-05 | 1988-04-20 | Pyrene Chemical Services Ltd | Process for producing phosphate coatings |
GB2199047A (en) * | 1986-10-16 | 1988-06-29 | Nihon Parkerizing | Forming phosphate coatings |
EP0315059A1 (fr) * | 1987-10-30 | 1989-05-10 | HENKEL CORPORATION (a Delaware corp.) | Procédé et composition pour former un revêtement au phosphate de zinc |
US5904786A (en) * | 1994-12-09 | 1999-05-18 | Metallgesellschaft Aktiengesellschaft | Method of applying phosphate coatings to metal surfaces |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0091441A1 (fr) * | 1981-10-22 | 1983-10-19 | Data Peripherals | Procede et dispositif de positionnement d'un transducteur utilisant un codage de servo-piste noyee et une commande par microprocesseur |
DE3245411A1 (de) * | 1982-12-08 | 1984-07-05 | Gerhard Collardin GmbH, 5000 Köln | Verfahren zur phosphatierung elektrolytisch verzinkter metallwaren |
DE3325974A1 (de) * | 1983-07-19 | 1985-01-31 | Gerhard Collardin GmbH, 5000 Köln | Verfahren und universell anwendbare mittel zum beschleunigten aufbringen von phosphatueberzuegen auf metalloberflaechen |
AU605301B2 (en) * | 1983-08-23 | 1991-01-10 | Nippon Paint Co., Ltd. | Process for phosphating metal surfaces |
DE3407513A1 (de) * | 1984-03-01 | 1985-09-05 | Gerhard Collardin GmbH, 5000 Köln | Verfahren zur zink-calcium-phosphatierung von metalloberflaechen bei niedriger behandlungstemperatur |
DE3408577A1 (de) * | 1984-03-09 | 1985-09-12 | Metallgesellschaft Ag, 6000 Frankfurt | Verfahren zur phosphatierung von metallen |
ES8606528A1 (es) * | 1985-02-22 | 1986-04-01 | Henkel Iberica | Procedimiento para el fosfatado de superficies metalicas, especialmente ferreas |
JPS6267181A (ja) * | 1985-09-19 | 1987-03-26 | Nippon Parkerizing Co Ltd | チタン又はその合金材料の化成処理方法 |
JPS6283477A (ja) * | 1985-10-08 | 1987-04-16 | Nippon Parkerizing Co Ltd | 鉄鋼材の表面処理方法 |
US4663007A (en) * | 1985-10-25 | 1987-05-05 | Chrysler Motors Corporation | Method to evaluate sheet metal lubricants cratering potential on metal primer |
GB8527833D0 (en) * | 1985-11-12 | 1985-12-18 | Pyrene Chemicals Services Ltd | Phosphate coating of metals |
US5024697A (en) * | 1986-01-13 | 1991-06-18 | Ashland Oil, Inc. | Coating composition and method for forming a self-heating corrosion preventative film |
US5153032A (en) * | 1986-01-13 | 1992-10-06 | Ashland Oil, Inc. | Coating compositions and method for forming a self-healing corrosion preventative film |
US4981757A (en) * | 1986-01-13 | 1991-01-01 | Ashland Oil, Inc. | Coating compositions and method for forming a self-healing corrosion preventative film |
DE3631759A1 (de) * | 1986-09-18 | 1988-03-31 | Metallgesellschaft Ag | Verfahren zum erzeugen von phosphatueberzuegen auf metalloberflaechen |
US5238506A (en) * | 1986-09-26 | 1993-08-24 | Chemfil Corporation | Phosphate coating composition and method of applying a zinc-nickel-manganese phosphate coating |
EP0327153B1 (fr) * | 1988-02-03 | 1993-08-04 | Metallgesellschaft Ag | Procédé pour former des couches de phosphates sur des métaux |
DE3913089A1 (de) * | 1989-04-21 | 1990-10-25 | Henkel Kgaa | Chlorat- und nitritfreies verfahren zur herstellung von nickel- und manganhaltigen zinkphosphatschichten |
US5797987A (en) * | 1995-12-14 | 1998-08-25 | Ppg Industries, Inc. | Zinc phosphate conversion coating compositions and process |
JP3219371B2 (ja) * | 1996-03-21 | 2001-10-15 | 日本ペイント株式会社 | 金属成型物の塗装方法 |
AU4566900A (en) * | 1999-05-28 | 2000-12-18 | Henkel Kommanditgesellschaft Auf Aktien | Post-passivation of a phosphatized metal surface |
JP2001170557A (ja) * | 1999-12-21 | 2001-06-26 | Nisshin Steel Co Ltd | めっき鋼板用表面処理液およびその処理方法 |
AU2001249867A1 (en) * | 2000-04-07 | 2001-10-23 | Whyco Technologies, Inc. | Method of masking coatings and resultant object |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2049350A1 (de) * | 1969-10-08 | 1971-04-15 | Lubrizol Corp | Phosphatierungslosungen und ihre Verwendung zum Korrosionsschutz von Eisen metall und Zinkoberflachen |
DE2232067A1 (de) * | 1971-07-06 | 1973-01-18 | Metallgesellschaft Ag | Phosphatierungsloesungen |
DE2342558A1 (de) * | 1973-08-23 | 1975-03-20 | Metallgesellschaft Ag | Verfahren zur phosphatierung von metallen |
DE2538347A1 (de) * | 1974-08-30 | 1976-03-11 | Nippon Paint Co Ltd | Zinkphosphatloesungen zur ausbildung von zinkphosphatschichten auf metallen |
DE3004927A1 (de) * | 1979-02-13 | 1980-08-21 | Nippon Paint Co Ltd | Verfahren zur phosphatierung von metallen |
DE2907094A1 (de) * | 1979-02-23 | 1980-09-04 | Metallgesellschaft Ag | Phosphatierungsloesungen |
EP0018841A1 (fr) * | 1979-05-02 | 1980-11-12 | Amchem Products, Inc. a Corporation organised under the Laws of the State of Delaware United States of America | Composition et procédé pour revêtir de phosphate de zinc la surface d'un métal, surface revêtue d'un métal et procédé pour le vernissage de la surface enduite |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS506418A (fr) * | 1973-05-21 | 1975-01-23 | ||
NZ188918A (en) * | 1977-11-29 | 1981-01-23 | Ici Ltd | Applying phosphate coating to ferrous or zinciferous metal substrate and materials therefor |
JPS555589A (en) * | 1978-06-29 | 1980-01-16 | Mitsubishi Electric Corp | Audio amplifying circuit |
JPS5554576A (en) * | 1978-10-13 | 1980-04-21 | Nippon Parkerizing Co Ltd | Forming method for phosphate film of steel |
JPS5811515B2 (ja) * | 1979-05-11 | 1983-03-03 | 日本ペイント株式会社 | 金属表面にリン酸亜鉛皮膜を形成するための組成物 |
-
1981
- 1981-05-09 DE DE19813118375 patent/DE3118375A1/de active Granted
-
1982
- 1982-04-08 CA CA000400721A patent/CA1200470A/fr not_active Expired
- 1982-04-13 AU AU82564/82A patent/AU527375B2/en not_active Ceased
- 1982-04-21 ZA ZA822715A patent/ZA822715B/xx unknown
- 1982-04-30 US US06/373,475 patent/US4419199A/en not_active Expired - Lifetime
- 1982-04-30 PT PT74827A patent/PT74827B/fr unknown
- 1982-05-01 EP EP82200514A patent/EP0064790A1/fr not_active Ceased
- 1982-05-03 ES ES82511885A patent/ES8302794A1/es not_active Expired
- 1982-05-06 GB GB8213119A patent/GB2098242B/en not_active Expired
- 1982-05-07 JP JP57076448A patent/JPS6056429B2/ja not_active Expired
- 1982-05-07 MX MX192583A patent/MX159701A/es unknown
- 1982-05-07 BR BR8202637A patent/BR8202637A/pt not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2049350A1 (de) * | 1969-10-08 | 1971-04-15 | Lubrizol Corp | Phosphatierungslosungen und ihre Verwendung zum Korrosionsschutz von Eisen metall und Zinkoberflachen |
DE2232067A1 (de) * | 1971-07-06 | 1973-01-18 | Metallgesellschaft Ag | Phosphatierungsloesungen |
DE2342558A1 (de) * | 1973-08-23 | 1975-03-20 | Metallgesellschaft Ag | Verfahren zur phosphatierung von metallen |
DE2538347A1 (de) * | 1974-08-30 | 1976-03-11 | Nippon Paint Co Ltd | Zinkphosphatloesungen zur ausbildung von zinkphosphatschichten auf metallen |
DE3004927A1 (de) * | 1979-02-13 | 1980-08-21 | Nippon Paint Co Ltd | Verfahren zur phosphatierung von metallen |
DE2907094A1 (de) * | 1979-02-23 | 1980-09-04 | Metallgesellschaft Ag | Phosphatierungsloesungen |
EP0018841A1 (fr) * | 1979-05-02 | 1980-11-12 | Amchem Products, Inc. a Corporation organised under the Laws of the State of Delaware United States of America | Composition et procédé pour revêtir de phosphate de zinc la surface d'un métal, surface revêtue d'un métal et procédé pour le vernissage de la surface enduite |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2512840A1 (fr) * | 1981-09-17 | 1983-03-18 | Amchem Prod | Solutions aqueuses acides pour revetements de phosphate de zinc et leurs concentres, procedes de revetement les mettant en oeuvre et solutions d'activation du metal utilisables dans ces procedes |
EP0141341A1 (fr) * | 1983-10-26 | 1985-05-15 | Metallgesellschaft Ag | Procédé pour la formation de revêtements de phosphate |
GB2196024A (en) * | 1986-09-05 | 1988-04-20 | Pyrene Chemical Services Ltd | Process for producing phosphate coatings |
EP0261597A2 (fr) * | 1986-09-26 | 1988-03-30 | Ppg Industries, Inc. | Procédé pour appliquer un revêtement au phosphate de zinc et de nickel |
EP0261597A3 (en) * | 1986-09-26 | 1988-07-13 | Chemfil Corporation | Phosphate coating composition and method of applying a zinc-nickel phosphate coating |
GB2199047A (en) * | 1986-10-16 | 1988-06-29 | Nihon Parkerizing | Forming phosphate coatings |
GB2199047B (en) * | 1986-10-16 | 1990-12-12 | Nihon Parkerizing | Processes for forming phosphate coatings |
EP0315059A1 (fr) * | 1987-10-30 | 1989-05-10 | HENKEL CORPORATION (a Delaware corp.) | Procédé et composition pour former un revêtement au phosphate de zinc |
US4865653A (en) * | 1987-10-30 | 1989-09-12 | Henkel Corporation | Zinc phosphate coating process |
US5904786A (en) * | 1994-12-09 | 1999-05-18 | Metallgesellschaft Aktiengesellschaft | Method of applying phosphate coatings to metal surfaces |
Also Published As
Publication number | Publication date |
---|---|
ES511885A0 (es) | 1983-02-16 |
ZA822715B (en) | 1983-06-29 |
AU8256482A (en) | 1982-11-18 |
JPS57194258A (en) | 1982-11-29 |
AU527375B2 (en) | 1983-03-03 |
CA1200470A (fr) | 1986-02-11 |
DE3118375A1 (de) | 1982-11-25 |
DE3118375C2 (fr) | 1989-06-15 |
ES8302794A1 (es) | 1983-02-16 |
MX159701A (es) | 1989-08-08 |
GB2098242A (en) | 1982-11-17 |
US4419199A (en) | 1983-12-06 |
PT74827A (fr) | 1982-05-01 |
PT74827B (fr) | 1983-11-14 |
BR8202637A (pt) | 1983-04-19 |
GB2098242B (en) | 1984-05-02 |
JPS6056429B2 (ja) | 1985-12-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR IT NL SE |
|
17P | Request for examination filed |
Effective date: 19830506 |
|
18R | Application refused |
Effective date: 19880704 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
R18R | Application refused (corrected) |
Effective date: 19881014 |
|
APAF | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNE |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: VOLLING, GUDRUN Inventor name: MUELLER, GERHARD Inventor name: RAUSCH, WERNER, DR. Inventor name: HAUFFE, DIETER |