EP0157434A1 - Process for regulating the zinc and/or nickel content in phosphatizing solutions - Google Patents
Process for regulating the zinc and/or nickel content in phosphatizing solutions Download PDFInfo
- Publication number
- EP0157434A1 EP0157434A1 EP85200210A EP85200210A EP0157434A1 EP 0157434 A1 EP0157434 A1 EP 0157434A1 EP 85200210 A EP85200210 A EP 85200210A EP 85200210 A EP85200210 A EP 85200210A EP 0157434 A1 EP0157434 A1 EP 0157434A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- zinc
- nickel content
- calcium
- ethylenediaminetetraacetic acid
- phosphating
- 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.)
- Withdrawn
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
- C23C22/73—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 characterised by the process
- C23C22/77—Controlling or regulating of the coating process
Definitions
- the invention relates to a method for regulating the zinc and / or nickel content in phosphating baths for the treatment of metal surfaces, in which the zinc and / or nickel content determined by titration serves as a control variable for the metering of supplementary concentrate.
- a common method is to express the bath concentration by using ml n10 NaOH for the titration of a 10 ml bath sample against phenolphthalein as an indicator ( " total acid points").
- Another parameter is the electrical conductivity, which - like the total acid points - also only allows a general statement about the total concentration (W. Rausch w Die Phosphat réelle von Metallen “, Eugen G. Leuze Verlag, 7968 Saulgau / Württ., 1974, page 273 ff., In particular page 283).
- the object of the invention is to provide a method for controlling the zinc and / or nickel content in phosphating baths for the treatment of metal surfaces, which does not have the disadvantages of the known methods, is simple to carry out and in particular also permits automatic metering.
- 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 in order to determine the sum of the zinc and / or nickel content, a measured and excess amount of ethylenediaminetetraacetic acid is added to a sample of the phosphating bath and the excess is added with a Calcium standard solution is titrated back against a calcium sensitive electrode.
- the phosphate content By regulating the zinc and / or nickel content, the phosphate content, and possibly also the content of accelerators and other known components of phosphating baths, can also be regulated by means of a suitable supplementary concentrate.
- Another embodiment of the invention associated with a higher accuracy in the determination of the zinc and nickel contents provides the nickel content of the phosphating baths to be determined separately. This is done by a sample of the phosphating bath before the addition of ethylenediaminetetraacetic acid addition of T hioglycolat back-and the excess of ethylene diamine tetraacetic acid with a calcium standard solution against a calcium-sensitive electrode. The nickel content determined in this way serves as a control variable for the metering of supplementary concentrate.
- the inventive method is particularly advantageous when the complement of P occurs hosphatierbäder automatically, for example as described in principle in W. Rausch Phosphating of metals ", lc page 283.
- Phosphating baths to which the method according to the invention can be applied can have the following concentrations, for example for zinc, nickel and phosphate:
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)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Bei einem Verfahren zur Regelung des Zink- und/oder Nickelgehaltes in Phosphatierbädern zur Behandlung von Metalloberflächen wird zur Erzielung höherer Analysengenauigkeit und damit präziserer Badregelung zur Bestimmung der Summe des Zink- und/oder Nickelgehaltes zu einer Probe des Phosphatierbades eine abgemessene und überschüssige Menge an Äthylendiamintetraessigsäure zugegeben, der Überschuss mit einer Kalzium-Normallösung gegen eine Kalzium-sensitive Elektrode zurücktitriert und der durch Titration bestimmte Gehalt an Zink und/oder Nickel als Regelgrösse für die vorzugsweise automatische Dosierung von Ergänzungskonzentrat benutzt. Zur selektiven Bestimmung des Nickelgehaltes wird zu einer Probe des Phosphatierbades vor der Zugabe von Äthylendiamintetraessigsäure ein Zusatz von Thioglycolat gegeben und der Überschuss an Äthylendiamintetraessigsäure mit einer Kalzium-Normallösung gegen eine Kalzium-sensitive Elektrode zurücktitriert.In a method for controlling the zinc and / or nickel content in phosphating baths for treating metal surfaces, a measured and excess amount of ethylenediaminetetraacetic acid is used to achieve higher analysis accuracy and thus more precise bath control for determining the sum of the zinc and / or nickel content in a sample of the phosphating bath added, the excess is back-titrated with a calcium standard solution against a calcium-sensitive electrode and the content of zinc and / or nickel determined by titration is used as a control variable for the preferably automatic metering of supplementary concentrate. For the selective determination of the nickel content, an addition of thioglycolate is added to a sample of the phosphating bath before the addition of ethylenediaminetetraacetic acid and the excess of ethylenediaminetetraacetic acid is back-titrated with a calcium standard solution against a calcium-sensitive electrode.
Description
Die Erfindung betrifft ein Verfahren zur Regelung des Zink-und/oder Nickelgehaltes in Phosphatierbädern zur Behandlung von Metalloberflächen, bei dem der durch Titration bestimmte Gehalt an Zink und/oder Nickel als Regelgröße für die Dosierung von Ergänzungskonzentrat dient.The invention relates to a method for regulating the zinc and / or nickel content in phosphating baths for the treatment of metal surfaces, in which the zinc and / or nickel content determined by titration serves as a control variable for the metering of supplementary concentrate.
Beim praktischen Arbeiten mit Phosphatierbädern zur chemischen Oberflächenbehandlung von Metallen werden Badkomponenten durch Schichtbildung, Schlammausfällung und mechanische Badverluste verbraucht. Diese Verluste werden durch Zusatz von entsprechend zusammengesetztem Ergänzungskonzentrat zum Phosphatierbad wieder ausgeglichen. Zur Ermittlung des Chemikalienverbrauchs und der notwendigen Ergänzungsmenge wird die aktuelle Badkonzentration bestimmt und mit der Sollkonzentration verglichen.When working with phosphating baths for chemical surface treatment of metals, bath components are used up due to layer formation, sludge precipitation and mechanical bath losses. These losses are compensated for by adding a supplementary concentrate of the appropriate composition to the phosphating bath. The current bath concentration is determined and compared with the target concentration in order to determine the chemical consumption and the necessary supplementary amount.
Eine übliche Methode besteht darin, die Badkonzentration durch den Verbrauch an ml n10 NaOH für die Titration einer 10 ml-Badprobe gegen Phenolphthalein als Indikator auszudrücken ("Gesamtsäurepunkte"). Eine weitere Kenngröße ist die elektrische Leitfähigkeit, die - ähnlich wie die Gesamtsäurepunkte - ebenfalls nur eine pauschale Aussage über die Gesamtkonzentration erlaubt (W. Rausch wDie Phosphatierung von Metallen", Eugen G. Leuze Verlag, 7968 Saulgau/Württ., 1974, Seite 273 ff., insbesondere Seite 283).A common method is to express the bath concentration by using ml n10 NaOH for the titration of a 10 ml bath sample against phenolphthalein as an indicator ( " total acid points"). Another parameter is the electrical conductivity, which - like the total acid points - also only allows a general statement about the total concentration (W. Rausch w Die Phosphatierung von Metallen ", Eugen G. Leuze Verlag, 7968 Saulgau / Württ., 1974, page 273 ff., In particular page 283).
Mit der Einführung der .Niedrigzink"-Phosphatierverfahren (DE-OS 22 32 067, DE-OS 31 01 866) erlangt jedoch die Bestimmung des Zink- und gegebenenfalls des Nickelgehaltes und deren Aufrechterhaltung in engen Grenzen besondere Bedeutung. Zur Lösung dieser Aufgabe werden Titrierautomaten eingesetzt, die den Kationengehalt des Bades mit Hilfe der Komplexometrie unter kolorimetrischer Endpunktanzeige ermitteln und den so gewonnenen Meßwert für die Regelung der Badkonzentration verwenden. Die so gewonnenen Werte sind jedoch ungenau und gestatten nur die Bestimmung des Gesamtgehaltes an Nickel und Zink.With the introduction of the "low zinc" phosphating method (DE-OS 22 32 067, D E-OS 31 01 866), however, the determination of the zinc and possibly the nickel content and their maintenance within narrow limits become particularly important. To solve this problem titrator used that omplexometrie the cation content of the bath with the help of K under colorimetric endpoint display detect and use the thus obtained measured value for the regulation of the bath concentration. However, the values obtained are inaccurate and only allow the determination of total content of nickel and zinc.
Aufgabe der Erfindung ist es nun, ein Verfahren zur Regelung des Zink- und/oder Nickelgehaltes in Phosphatierbädern zur Behandlung von Metalloberflächen bereitzustellen, das die Nachteile der bekannten Verfahren nicht aufweist, einfach in der Durchführung ist und insbesondere auch eine automatische Dosierung gestattet.The object of the invention is to provide a method for controlling the zinc and / or nickel content in phosphating baths for the treatment of metal surfaces, which does not have the disadvantages of the known methods, is simple to carry out and in particular also permits automatic metering.
Die Aufgabe wird gelöst, indem man das Verfahren der eingangs genannten Art entsprechend der Erfindung derart ausstaltet, -daß zur Bestimmung der Summe des Zink-und/oder Nickelgehaltes zu einer Probe des Phosphatierbades eine abgemessene und überschüssige Menge an Äthylendiamintetraessigsäure zugegeben und der Überschuß mit einer Kalzium-Normallösung gegen eine Kalzium-sensitive Elektrode zurücktitriert wird.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 in order to determine the sum of the zinc and / or nickel content, a measured and excess amount of ethylenediaminetetraacetic acid is added to a sample of the phosphating bath and the excess is added with a Calcium standard solution is titrated back against a calcium sensitive electrode.
Mit der Regelung des Zink- und/oder Nickelgehaltes kann über ein geeignetes Ergänzungskonzentrat auch der Phosphatgehalt, gegebenenfalls auch der Gehalt an Beschleunigern und anderen bekannten Bestandteilen von Phosphatierbädern geregelt werden.By regulating the zinc and / or nickel content, the phosphate content, and possibly also the content of accelerators and other known components of phosphating baths, can also be regulated by means of a suitable supplementary concentrate.
Eine weitere mit einer höheren Genauigkeit in der Bestimmung der Zink- und Nickelgehalte verbundene Ausführungsform der Erfindung sieht vor, den Nickelgehalt der Phosphatierbäder gesondert zu bestimmen. Hierzu wird zu einer Probe des Phosphatierbades vor der Zugabe von Äthylendiamintetraessigsäure ein Zusatz von Thioglycolat vorgenommen und der Überschuß an Äthylendiamintetraessigsäure mit einer Kalzium-Normallösung gegen eine Kalzium-sensitive Elektrode zurücktitriert. Der so ermittelte Gehalt an Nickel dient als Regelgröße für die Dosierung von Ergänzungskonzentrat.Another embodiment of the invention associated with a higher accuracy in the determination of the zinc and nickel contents provides the nickel content of the phosphating baths to be determined separately. This is done by a sample of the phosphating bath before the addition of ethylenediaminetetraacetic acid addition of T hioglycolat back-and the excess of ethylene diamine tetraacetic acid with a calcium standard solution against a calcium-sensitive electrode. The nickel content determined in this way serves as a control variable for the metering of supplementary concentrate.
Falls die Kenntnis der Konzentration an Zink als Regelgröße für die Ergänzung notwendig ist, wird sein Gehalt rechnerisch aus der Differenz der Badkonzentrationen an Nickel und Zink sowie an Nickel allein ermittelt.If it is necessary to know the concentration of zinc as a controlled variable for the supplement, its content is calculated from the difference between the bath concentrations of nickel and zinc and of nickel alone.
Das erfindungsgemäße Verfahren ist von besonderem Vorteil, wenn die Ergänzung der Phosphatierbäder automatisch erfolgt, beispielsweise wie im Prinzip bei W. Rausch Die Phosphatierung von Metallen", l.c. Seite 283, beschrieben.The inventive method is particularly advantageous when the complement of P occurs hosphatierbäder automatically, for example as described in principle in W. Rausch Phosphating of metals ", lc page 283.
Phosphatierbäder, auf die das erfindungsgemäße Verfahren angewendet werden kann, können beispielsweise für Zink, Nickel und Phosphat folgende Konzentrationen aufweisen:
Von besonderem Vorteil erweist es sich für Bäder mit 0,2 bis 1,5 g/1 Zink und 0 bis 1,5 g/1 Nickel, die neben den genannten Komponenten noch die in der Phosphatiertechnik üblichen Zusätze zur Beschleunigung, Oxidation, Aktivierung und Schichtmodifikation enthalten können und die beispielsweise mit Zink, Nickel und P205 im Gewichtsverhältnis von (0,18 bis 0,33) : (0 bis 0,06) : 1 ergänzt werden. Ein in die letztgenannte Kategorie fallendes Verfahren ist beispielsweise in der EP-OS 64 790 beschrieben.It proves to be particularly advantageous for baths with 0.2 to 1.5 g / 1 zinc and 0 to 1.5 g / 1 nickel which, in addition to the components mentioned, also the additives for acceleration, oxidation, activation and, which are customary in phosphating technology May contain layer modification and which are supplemented, for example, with zinc, nickel and P 2 0 5 in a weight ratio of (0.18 to 0.33): (0 to 0.06): 1. A method falling into the latter category is described for example in EP-OS 64 790.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37670/84 | 1984-02-29 | ||
| JP59037670A JPS60184684A (en) | 1984-02-29 | 1984-02-29 | Control method for zinc phosphate-based film conversion treatment solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0157434A1 true EP0157434A1 (en) | 1985-10-09 |
Family
ID=12504065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85200210A Withdrawn EP0157434A1 (en) | 1984-02-29 | 1985-02-20 | Process for regulating the zinc and/or nickel content in phosphatizing solutions |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4612060A (en) |
| EP (1) | EP0157434A1 (en) |
| JP (1) | JPS60184684A (en) |
| AU (1) | AU580285B2 (en) |
| BR (1) | BR8500893A (en) |
| CA (1) | CA1224390A (en) |
| GB (1) | GB2155047B (en) |
| NZ (1) | NZ211231A (en) |
| ZA (1) | ZA851539B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375153A1 (en) * | 1988-12-22 | 1990-06-27 | Ford Motor Company Limited | Detection system for chemical analysis of zinc phosphate coating solutions |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4793867A (en) * | 1986-09-26 | 1988-12-27 | Chemfil Corporation | Phosphate coating composition and method of applying a zinc-nickel phosphate coating |
| US5261973A (en) * | 1991-07-29 | 1993-11-16 | Henkel Corporation | Zinc phosphate conversion coating and process |
| US5413628A (en) * | 1993-09-22 | 1995-05-09 | Savin; Ronald R. | Stable inorganic zinc-powder rich coating composition |
| US5338348A (en) * | 1993-09-22 | 1994-08-16 | Savin Roland R | Zinc powder-rich coating composition |
| CN112630284A (en) * | 2020-12-18 | 2021-04-09 | 湖南航天天麓新材料检测有限责任公司智能检测装备分公司 | Phosphating tank liquid on-line detection and automatic supply system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1380855A (en) * | 1963-03-15 | 1965-03-15 | ||
| DE1900058A1 (en) * | 1969-01-02 | 1970-08-13 | Metallgesellschaft Ag | Control of aqueous solution content of - ions of multi-valent metals |
| US3878059A (en) * | 1974-05-28 | 1975-04-15 | Univ Iowa State Res Found Inc | Method of chelometric titration of metal cations using tungsten bronze electrode |
| GB1558553A (en) * | 1978-03-21 | 1980-01-03 | Nat Res Dev | Calcium-selective electrode |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU507110B2 (en) * | 1975-04-23 | 1980-02-07 | Ici Ltd. | Phosphating process |
| GB1585057A (en) * | 1976-06-28 | 1981-02-25 | Ici Ltd | Sensing concentration of coating solution |
| JPS5456038A (en) * | 1977-10-12 | 1979-05-04 | Nippon Paint Co Ltd | Controlling method for acidic phosphate film forming liquid |
| JPS563677A (en) * | 1979-06-19 | 1981-01-14 | Hitachi Ltd | Method and apparatus for controlling chemical treating fluid |
| US4515643A (en) * | 1982-10-22 | 1985-05-07 | Henkel Kommanditgesellschaft Auf Aktien | Method for determining and adjusting the potency and effectiveness of a metal phosphate conversion coating process |
-
1984
- 1984-02-29 JP JP59037670A patent/JPS60184684A/en active Granted
-
1985
- 1985-02-20 EP EP85200210A patent/EP0157434A1/en not_active Withdrawn
- 1985-02-25 US US06/704,819 patent/US4612060A/en not_active Expired - Fee Related
- 1985-02-26 NZ NZ211231A patent/NZ211231A/en unknown
- 1985-02-28 AU AU39256/85A patent/AU580285B2/en not_active Ceased
- 1985-02-28 CA CA000475483A patent/CA1224390A/en not_active Expired
- 1985-02-28 ZA ZA851539A patent/ZA851539B/en unknown
- 1985-02-28 GB GB08505209A patent/GB2155047B/en not_active Expired
- 1985-02-28 BR BR8500893A patent/BR8500893A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1380855A (en) * | 1963-03-15 | 1965-03-15 | ||
| DE1900058A1 (en) * | 1969-01-02 | 1970-08-13 | Metallgesellschaft Ag | Control of aqueous solution content of - ions of multi-valent metals |
| US3878059A (en) * | 1974-05-28 | 1975-04-15 | Univ Iowa State Res Found Inc | Method of chelometric titration of metal cations using tungsten bronze electrode |
| GB1558553A (en) * | 1978-03-21 | 1980-01-03 | Nat Res Dev | Calcium-selective electrode |
Non-Patent Citations (2)
| Title |
|---|
| C.L. WILSON: "COMPREHENSIVE ANALYTICAL CHEMISTRY", Band IB, "Classical Analysis", 1960, Seiten 348-349, Elsevier Publishing Company, Amsterdam, NL; * |
| METAL FINISHING, Band 60, Nr. 12, Dezember 1962, Seiten 42-46, Hackensach, New Jersey, US; S. SPRING: "Phosphate coatings and their control" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375153A1 (en) * | 1988-12-22 | 1990-06-27 | Ford Motor Company Limited | Detection system for chemical analysis of zinc phosphate coating solutions |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60184684A (en) | 1985-09-20 |
| AU3925685A (en) | 1985-09-05 |
| AU580285B2 (en) | 1989-01-12 |
| GB8505209D0 (en) | 1985-04-03 |
| NZ211231A (en) | 1988-01-08 |
| CA1224390A (en) | 1987-07-21 |
| BR8500893A (en) | 1985-10-22 |
| JPS639587B2 (en) | 1988-02-29 |
| US4612060A (en) | 1986-09-16 |
| GB2155047B (en) | 1987-11-18 |
| ZA851539B (en) | 1986-05-28 |
| GB2155047A (en) | 1985-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2757458C2 (en) | ||
| EP0045110B1 (en) | Method for the production of phosphate coatings on iron and steel surfaces, and its use | |
| DE2729115A1 (en) | METHOD AND DEVICE FOR DETERMINING THE EFFECTIVE CONCENTRATION OF AN ELECTROACTIVE COMPONENT | |
| DE68905311T2 (en) | DETERMINATION SYSTEM FOR CHEMICAL ANALYSIS OF ZINC PHOSPHATE COATING SOLUTIONS. | |
| EP0157434A1 (en) | Process for regulating the zinc and/or nickel content in phosphatizing solutions | |
| EP0069950A1 (en) | Process for phosphating metal surfaces | |
| DE2157043A1 (en) | Method for controlling the layer weight of coatings | |
| EP0262582B1 (en) | Method for determining the concentration ratio of lithium to sodium ions and apparatus for carrying out this method | |
| DE3913089A1 (en) | CHLORATE- AND NITRITE-FREE METHOD FOR THE PRODUCTION OF NICKEL- AND MANGANE-CONTAINING ZINC PHOSPHATE LAYERS | |
| EP0529332A1 (en) | Process for automatically controllable lowering the nitrite content in nitrite containing aqueous solutions to a concentration of less than 1 mg/l | |
| DE69700271T2 (en) | Process for zinc phosphating metal moldings | |
| EP0171842A1 (en) | Process for maintaining the zinc concentration in zinc phosphating baths | |
| DE2213781C3 (en) | Process for the phosphating of steel | |
| EP0246494B1 (en) | Process for supplying additives to electroplating baths by polarography | |
| AT346150B (en) | PROCEDURE FOR PICKLING BATH CONTROL IN CONTINUOUSLY OPERATING PICKLING PLANTS | |
| DE68925261T2 (en) | Electrolytic sensors | |
| DE2629879A1 (en) | PROCEDURE FOR THE MAINTENANCE OF A GALVANIC CHROMING BATH BASED ON 3-VALUE CHROME AND THE EQUIPMENT USED FOR THIS | |
| EP0162489A1 (en) | Process for controlling fluoride-containing baths for metal surface treatment | |
| DE2064822C3 (en) | Method for the electrometric determination of the cyanide ion concentration in solutions | |
| DE3018511C2 (en) | Process for the chemical nickel plating of metal bodies | |
| DE2037920A1 (en) | ||
| EP0492714A1 (en) | Nitrite determination in phosphatizing solutions | |
| DE583349C (en) | Process to improve the rust-protecting phosphate coatings on iron objects | |
| DE3147538C2 (en) | Method for the determination of transferrin and suitable means | |
| DE2237804A1 (en) | CONTINUOUS REDOX PROCESS AND DEVICE FOR LOSSING COPPER |
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): BE DE FR IT NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19860111 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SATO, YOKICHI Inventor name: SAITO, TSUNEO Inventor name: KOJIMA, RYUJI Inventor name: SUZUKI, NAOMI |