DE3248006A1 - Mittel und verfahren zum selektiven chemischen entfernen harter oberflaechenueberzuege von substraten aus superlegierung - Google Patents
Mittel und verfahren zum selektiven chemischen entfernen harter oberflaechenueberzuege von substraten aus superlegierungInfo
- Publication number
- DE3248006A1 DE3248006A1 DE19823248006 DE3248006A DE3248006A1 DE 3248006 A1 DE3248006 A1 DE 3248006A1 DE 19823248006 DE19823248006 DE 19823248006 DE 3248006 A DE3248006 A DE 3248006A DE 3248006 A1 DE3248006 A1 DE 3248006A1
- Authority
- DE
- Germany
- Prior art keywords
- solution
- water
- hard surface
- soluble
- nickel
- 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- Withdrawn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
- 239000000758 substrate Substances 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 22
- 239000003795 chemical substances by application Substances 0.000 title claims description 7
- 239000000126 substance Substances 0.000 title description 15
- 229910000601 superalloy Inorganic materials 0.000 title description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 46
- 238000000576 coating method Methods 0.000 claims description 44
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 229910052759 nickel Inorganic materials 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 17
- -1 fluoride ions Chemical class 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000011195 cermet Substances 0.000 claims description 9
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 8
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Natural products C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 8
- 239000011737 fluorine Substances 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 6
- 150000001491 aromatic compounds Chemical class 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- RILZRCJGXSFXNE-UHFFFAOYSA-N 2-[4-(trifluoromethoxy)phenyl]ethanol Chemical compound OCCC1=CC=C(OC(F)(F)F)C=C1 RILZRCJGXSFXNE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 239000010437 gem Substances 0.000 claims 1
- LJRGBERXYNQPJI-UHFFFAOYSA-M sodium;3-nitrobenzenesulfonate Chemical compound [Na+].[O-][N+](=O)C1=CC=CC(S([O-])(=O)=O)=C1 LJRGBERXYNQPJI-UHFFFAOYSA-M 0.000 claims 1
- 239000000243 solution Substances 0.000 description 28
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- PPSSQRUPSRPZON-UHFFFAOYSA-N nitrobenzene;sodium Chemical compound [Na].[O-][N+](=O)C1=CC=CC=C1 PPSSQRUPSRPZON-UHFFFAOYSA-N 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010297 mechanical methods and process Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000005524 ceramic coating Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005474 detonation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical group [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000001257 hydrogen Chemical group 0.000 description 1
- 229910052739 hydrogen Chemical group 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011214 refractory ceramic Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000000080 wetting agent Substances 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
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/08—Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
Landscapes
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Coating By Spraying Or Casting (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34196582A | 1982-01-22 | 1982-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3248006A1 true DE3248006A1 (de) | 1983-07-28 |
Family
ID=23339766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19823248006 Withdrawn DE3248006A1 (de) | 1982-01-22 | 1982-12-24 | Mittel und verfahren zum selektiven chemischen entfernen harter oberflaechenueberzuege von substraten aus superlegierung |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS58130280A (es) |
| AU (1) | AU546054B2 (es) |
| BE (1) | BE895241A (es) |
| CA (1) | CA1185152A (es) |
| CH (1) | CH651849A5 (es) |
| DE (1) | DE3248006A1 (es) |
| ES (1) | ES519129A0 (es) |
| FR (1) | FR2520374B1 (es) |
| GB (1) | GB2115013B (es) |
| IT (1) | IT1164864B (es) |
| SE (1) | SE8207490L (es) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4113283A1 (de) * | 1991-04-24 | 1992-10-29 | Kernforschungsz Karlsruhe | Aetzloesung und verfahren zum abaetzen einer metallschicht |
| DE4219667A1 (de) * | 1992-06-16 | 1993-12-23 | Kernforschungsz Karlsruhe | Werkzeug und Verfahren zur Herstellung einer mikrostrukturierten Kunststoffschicht |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5976265A (en) * | 1998-04-27 | 1999-11-02 | General Electric Company | Method for removing an aluminide-containing material from a metal substrate |
| US6494960B1 (en) * | 1998-04-27 | 2002-12-17 | General Electric Company | Method for removing an aluminide coating from a substrate |
| GB9814075D0 (en) * | 1998-06-29 | 1998-08-26 | Ge Aircraft Engine Services Li | Method of stripping a coating from an aircraft engine part |
| DE19833990A1 (de) * | 1998-07-29 | 2000-02-10 | Metallgesellschaft Ag | Beizmittel für Edelstähle |
| US6379749B2 (en) * | 2000-01-20 | 2002-04-30 | General Electric Company | Method of removing ceramic coatings |
| US6238743B1 (en) * | 2000-01-20 | 2001-05-29 | General Electric Company | Method of removing a thermal barrier coating |
| US6833328B1 (en) | 2000-06-09 | 2004-12-21 | General Electric Company | Method for removing a coating from a substrate, and related compositions |
| US6863738B2 (en) | 2001-01-29 | 2005-03-08 | General Electric Company | Method for removing oxides and coatings from a substrate |
| US6953533B2 (en) | 2003-06-16 | 2005-10-11 | General Electric Company | Process for removing chromide coatings from metal substrates, and related compositions |
| US20070116875A1 (en) | 2005-11-22 | 2007-05-24 | United Technologies Corporation | Strip process for superalloys |
| CN102978631B (zh) * | 2011-09-06 | 2014-12-10 | 沈阳黎明航空发动机(集团)有限责任公司 | 一种精密钛合金零件除重熔层的方法 |
| IT202100025232A1 (it) * | 2021-10-01 | 2023-04-01 | T A G Srl | Metodo di rimozione di un rivestimento di barriera termica ceramica |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2698781A (en) * | 1953-04-27 | 1955-01-04 | Enthone | Accelerating action of acids on metals |
| DE2824975A1 (de) * | 1978-06-07 | 1979-12-20 | Basf Ag | Verwendung von wasserloeslichen, vernetzten stickstoffhaltigen kondensationsprodukten als zusatz fuer beiz-, polier- und entmetallisierungsbaeder |
| DE3048209A1 (de) * | 1979-12-26 | 1981-10-15 | General Electric Co., Schenectady, N.Y. | "verfahren zum entfernen eines fuellstoffmaterials" |
| US4302246A (en) * | 1980-01-03 | 1981-11-24 | Enthone, Incorporated | Solution and method for selectively stripping alloys containing nickel with gold, phosphorous or chromium from stainless steel and related nickel base alloys |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1926228C3 (de) * | 1969-05-22 | 1974-02-21 | Bergische Metallwarenfabrik Dillenberg & Co Kg, 5601 Gruiten | Bad zum elektrolytischen Ablösen von Metallüberzügen aus Nickel oder Chrom von Grundkörpern aus Buntmetall |
| FR2345503A1 (fr) * | 1976-03-22 | 1977-10-21 | Oxy Metal Industries Corp | Compositions et procede pour l'enlevement d'alliages de nickel deposes par voie electrolytique |
| JPS52133830A (en) * | 1976-05-04 | 1977-11-09 | Nihon Kagaku Kizai Kk | Metal coat exfoliating solution |
| JPS579874A (en) * | 1980-06-17 | 1982-01-19 | Toshiba Corp | Etching solution for nickel |
-
1982
- 1982-11-10 CA CA000415360A patent/CA1185152A/en not_active Expired
- 1982-11-12 AU AU90416/82A patent/AU546054B2/en not_active Ceased
- 1982-12-03 BE BE0/209645A patent/BE895241A/fr not_active IP Right Cessation
- 1982-12-20 CH CH7416/82A patent/CH651849A5/de not_active IP Right Cessation
- 1982-12-24 DE DE19823248006 patent/DE3248006A1/de not_active Withdrawn
- 1982-12-29 SE SE8207490A patent/SE8207490L/ not_active Application Discontinuation
-
1983
- 1983-01-18 GB GB08301268A patent/GB2115013B/en not_active Expired
- 1983-01-19 FR FR8300786A patent/FR2520374B1/fr not_active Expired
- 1983-01-20 ES ES519129A patent/ES519129A0/es active Granted
- 1983-01-21 JP JP58007476A patent/JPS58130280A/ja active Granted
- 1983-01-21 IT IT47598/83A patent/IT1164864B/it active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2698781A (en) * | 1953-04-27 | 1955-01-04 | Enthone | Accelerating action of acids on metals |
| DE2824975A1 (de) * | 1978-06-07 | 1979-12-20 | Basf Ag | Verwendung von wasserloeslichen, vernetzten stickstoffhaltigen kondensationsprodukten als zusatz fuer beiz-, polier- und entmetallisierungsbaeder |
| DE3048209A1 (de) * | 1979-12-26 | 1981-10-15 | General Electric Co., Schenectady, N.Y. | "verfahren zum entfernen eines fuellstoffmaterials" |
| US4302246A (en) * | 1980-01-03 | 1981-11-24 | Enthone, Incorporated | Solution and method for selectively stripping alloys containing nickel with gold, phosphorous or chromium from stainless steel and related nickel base alloys |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4113283A1 (de) * | 1991-04-24 | 1992-10-29 | Kernforschungsz Karlsruhe | Aetzloesung und verfahren zum abaetzen einer metallschicht |
| US5462640A (en) * | 1991-04-24 | 1995-10-31 | Kernforschungszentrum Karlsruhe Gmbh | Etching solution |
| DE4219667A1 (de) * | 1992-06-16 | 1993-12-23 | Kernforschungsz Karlsruhe | Werkzeug und Verfahren zur Herstellung einer mikrostrukturierten Kunststoffschicht |
Also Published As
| Publication number | Publication date |
|---|---|
| ES8402624A1 (es) | 1984-02-01 |
| FR2520374B1 (fr) | 1988-06-24 |
| IT1164864B (it) | 1987-04-15 |
| AU546054B2 (en) | 1985-08-15 |
| GB8301268D0 (en) | 1983-02-16 |
| GB2115013B (en) | 1985-12-18 |
| ES519129A0 (es) | 1984-02-01 |
| AU9041682A (en) | 1983-07-28 |
| SE8207490L (sv) | 1983-07-23 |
| CA1185152A (en) | 1985-04-09 |
| JPS58130280A (ja) | 1983-08-03 |
| SE8207490D0 (sv) | 1982-12-29 |
| IT8347598A0 (it) | 1983-01-21 |
| GB2115013A (en) | 1983-09-01 |
| JPS6261670B2 (es) | 1987-12-22 |
| FR2520374A1 (fr) | 1983-07-29 |
| BE895241A (fr) | 1983-03-31 |
| CH651849A5 (de) | 1985-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8130 | Withdrawal |