DE3014876A1 - Alterungsverfahren fuer einen abgassauerstoffsensor - Google Patents
Alterungsverfahren fuer einen abgassauerstoffsensorInfo
- Publication number
- DE3014876A1 DE3014876A1 DE19803014876 DE3014876A DE3014876A1 DE 3014876 A1 DE3014876 A1 DE 3014876A1 DE 19803014876 DE19803014876 DE 19803014876 DE 3014876 A DE3014876 A DE 3014876A DE 3014876 A1 DE3014876 A1 DE 3014876A1
- Authority
- DE
- Germany
- Prior art keywords
- sensor
- electrode
- zirconium oxide
- exhaust gas
- temperature
- 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.)
- Granted
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 12
- 239000001301 oxygen Substances 0.000 title claims description 12
- 229910052760 oxygen Inorganic materials 0.000 title claims description 12
- 230000032683 aging Effects 0.000 title 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 40
- 238000011282 treatment Methods 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 20
- 229910052697 platinum Inorganic materials 0.000 claims description 20
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 18
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 230000004044 response Effects 0.000 claims description 16
- 239000010409 thin film Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000007784 solid electrolyte Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 229910052596 spinel Inorganic materials 0.000 claims description 3
- 239000011029 spinel Substances 0.000 claims description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims 2
- 238000010285 flame spraying Methods 0.000 claims 2
- 229910052786 argon Inorganic materials 0.000 claims 1
- 239000011261 inert gas Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical group O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 8
- 239000000446 fuel Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 3
- 230000001627 detrimental effect Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- -1 magnesium aluminate Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000007736 thin film deposition technique Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/06—Surface treatment of glass, not in the form of fibres or filaments, by coating with metals
- C03C17/09—Surface treatment of glass, not in the form of fibres or filaments, by coating with metals by deposition from the vapour phase
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
- C04B41/5122—Pd or Pt
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/88—Metals
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5806—Thermal treatment
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/584—Non-reactive treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9041—Metals or alloys
- H01M4/905—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC
- H01M4/9058—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC of noble metals or noble-metal based alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Electrochemistry (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Thermal Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Geochemistry & Mineralogy (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/030,747 US4253934A (en) | 1979-04-17 | 1979-04-17 | Aging treatment for exhaust gas oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3014876A1 true DE3014876A1 (de) | 1980-11-06 |
| DE3014876C2 DE3014876C2 (en:Method) | 1990-03-22 |
Family
ID=21855811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19803014876 Granted DE3014876A1 (de) | 1979-04-17 | 1980-04-17 | Alterungsverfahren fuer einen abgassauerstoffsensor |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4253934A (en:Method) |
| JP (1) | JPS55141664A (en:Method) |
| CA (1) | CA1135035A (en:Method) |
| DE (1) | DE3014876A1 (en:Method) |
| FR (1) | FR2454620A1 (en:Method) |
| GB (1) | GB2046800B (en:Method) |
| IT (1) | IT1174284B (en:Method) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5692447A (en) * | 1979-12-26 | 1981-07-27 | Nissan Motor Co Ltd | Production of film-structure oxygen sensor element |
| JPS56160653A (en) * | 1980-05-14 | 1981-12-10 | Ngk Spark Plug Co Ltd | Manufacture of oxygen concentration cell |
| DE3319186A1 (de) * | 1983-05-27 | 1984-11-29 | Bosch Gmbh Robert | Verfahren zur erzeugung eines referenzpotentials bei potentiometrischen lambdasonden |
| US4521287A (en) * | 1984-06-28 | 1985-06-04 | General Motors Corporation | High rate sputtering of exhaust oxygen sensor electrode |
| JPS6130760A (ja) * | 1984-07-24 | 1986-02-13 | Toyota Central Res & Dev Lab Inc | 酸素センサ−及びその製造方法 |
| US4668374A (en) * | 1986-07-07 | 1987-05-26 | General Motors Corporation | Gas sensor and method of fabricating same |
| US6315880B1 (en) | 1997-10-16 | 2001-11-13 | Mary R. Reidmeyer | Chemical plating method, electrolytic cell and automotive oxygen sensor using it |
| US7527718B2 (en) * | 2004-03-29 | 2009-05-05 | Ngk Insulators, Ltd. | Method of treating gas sensor element |
| JP4587855B2 (ja) * | 2004-03-29 | 2010-11-24 | 日本碍子株式会社 | ガスセンサ素子の処理方法 |
| JP5413387B2 (ja) * | 2011-03-04 | 2014-02-12 | トヨタ自動車株式会社 | 酸素センサの活性化処理方法及び酸素センサ |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3844920A (en) * | 1973-11-21 | 1974-10-29 | Gen Motors Corp | Air fuel ratio sensor |
| US4116883A (en) * | 1975-02-26 | 1978-09-26 | General Motors Corporation | Catalyst support coating slurry and coatings |
| US4136000A (en) * | 1978-03-13 | 1979-01-23 | Bendix Autolite Corporation | Process for producing improved solid electrolyte oxygen gas sensors |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR96061E (fr) * | 1967-11-02 | 1972-05-19 | Gen Electric | Corps composé et procédé pour son faÇonnage, notamment utilisable comme corps électrode-électrolyte. |
| US3978006A (en) * | 1972-02-10 | 1976-08-31 | Robert Bosch G.M.B.H. | Methods for producing oxygen-sensing element, particularly for use with internal combustion engine exhaust emission analysis |
| US4021326A (en) * | 1972-06-02 | 1977-05-03 | Robert Bosch G.M.B.H. | Electro-chemical sensor |
| JPS5033892A (en:Method) * | 1973-07-24 | 1975-04-01 | ||
| AU8441575A (en) * | 1974-09-02 | 1977-03-03 | The Broken Hill Proprietary Company Limited | Improved method of applying electrodes to ceramic electrochemical gas analysers |
| GB1524520A (en) | 1974-12-09 | 1978-09-13 | Kent Ltd G | Bonding of metals to solid electrolytes |
| US4040929A (en) * | 1975-09-15 | 1977-08-09 | Universal Oil Products Company | Oxygen sensor having thin film electrolyte |
| FR2350598A1 (fr) * | 1976-05-07 | 1977-12-02 | Thomson Csf | Senseur de concentration d'une espece dans un fluide |
| JPS6011428B2 (ja) * | 1977-01-31 | 1985-03-26 | 日本碍子株式会社 | 酸素濃淡電池の製造方法 |
| US4186071A (en) * | 1978-03-13 | 1980-01-29 | Bendix Autolite Corporation | Process for producing oxygen gas sensor elements |
| US4169777A (en) * | 1978-03-13 | 1979-10-02 | Bendix Autolite Corporation | Process for producing an activated oxygen gas sensor element |
| CA1119250A (en) * | 1978-09-13 | 1982-03-02 | Bendix Autolite Corporation | Process for producing an activated oxygen gas sensor element |
| CA1125857A (en) * | 1978-09-13 | 1982-06-15 | Ching T. Young | Process for producing a solid electrolyte oxygen gas sensing element |
-
1979
- 1979-04-17 US US06/030,747 patent/US4253934A/en not_active Expired - Lifetime
- 1979-12-14 CA CA000341944A patent/CA1135035A/en not_active Expired
-
1980
- 1980-04-02 GB GB8011189A patent/GB2046800B/en not_active Expired
- 1980-04-15 JP JP4880680A patent/JPS55141664A/ja active Granted
- 1980-04-15 IT IT48416/80A patent/IT1174284B/it active
- 1980-04-17 FR FR8008602A patent/FR2454620A1/fr active Granted
- 1980-04-17 DE DE19803014876 patent/DE3014876A1/de active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3844920A (en) * | 1973-11-21 | 1974-10-29 | Gen Motors Corp | Air fuel ratio sensor |
| US4116883A (en) * | 1975-02-26 | 1978-09-26 | General Motors Corporation | Catalyst support coating slurry and coatings |
| US4136000A (en) * | 1978-03-13 | 1979-01-23 | Bendix Autolite Corporation | Process for producing improved solid electrolyte oxygen gas sensors |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8048416A0 (it) | 1980-04-15 |
| US4253934A (en) | 1981-03-03 |
| CA1135035A (en) | 1982-11-09 |
| GB2046800B (en) | 1983-04-20 |
| JPS6238655B2 (en:Method) | 1987-08-19 |
| FR2454620A1 (fr) | 1980-11-14 |
| GB2046800A (en) | 1980-11-19 |
| DE3014876C2 (en:Method) | 1990-03-22 |
| JPS55141664A (en) | 1980-11-05 |
| FR2454620B1 (en:Method) | 1983-07-08 |
| IT1174284B (it) | 1987-07-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |