DE2108457C3 - Verfahren zur Herstellung von pulverförmigem wolframhaltigem Elektrodenmaterial für elektrochemische Zellen - Google Patents
Verfahren zur Herstellung von pulverförmigem wolframhaltigem Elektrodenmaterial für elektrochemische ZellenInfo
- Publication number
- DE2108457C3 DE2108457C3 DE2108457A DE2108457A DE2108457C3 DE 2108457 C3 DE2108457 C3 DE 2108457C3 DE 2108457 A DE2108457 A DE 2108457A DE 2108457 A DE2108457 A DE 2108457A DE 2108457 C3 DE2108457 C3 DE 2108457C3
- Authority
- DE
- Germany
- Prior art keywords
- tungsten
- carbon
- organic substance
- electrodes
- gas
- 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.)
- Expired
Links
- 239000007772 electrode material Substances 0.000 title claims description 33
- 238000000034 method Methods 0.000 title claims description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims description 11
- 229910052721 tungsten Inorganic materials 0.000 title claims description 11
- 239000010937 tungsten Substances 0.000 title claims description 11
- 239000000126 substance Substances 0.000 claims description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 21
- 239000001257 hydrogen Substances 0.000 claims description 20
- 229910052739 hydrogen Inorganic materials 0.000 claims description 20
- 150000003658 tungsten compounds Chemical class 0.000 claims description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 17
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 claims description 11
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000007795 chemical reaction product Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 7
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims description 7
- 239000012298 atmosphere Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 239000011592 zinc chloride Substances 0.000 claims description 4
- 235000005074 zinc chloride Nutrition 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005255 carburizing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 230000007717 exclusion Effects 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 150000001720 carbohydrates Chemical class 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims 2
- 239000004744 fabric Substances 0.000 claims 2
- 238000009656 pre-carbonization Methods 0.000 claims 2
- 125000000446 sulfanediyl group Chemical group *S* 0.000 claims 2
- 238000007669 thermal treatment Methods 0.000 claims 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 239000000654 additive Substances 0.000 claims 1
- 239000006229 carbon black Substances 0.000 claims 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims 1
- 238000010000 carbonizing Methods 0.000 claims 1
- 239000002482 conductive additive Substances 0.000 claims 1
- 229910021385 hard carbon Inorganic materials 0.000 claims 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 239000012495 reaction gas Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 description 6
- DZKDPOPGYFUOGI-UHFFFAOYSA-N tungsten(iv) oxide Chemical compound O=[W]=O DZKDPOPGYFUOGI-UHFFFAOYSA-N 0.000 description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 229920002472 Starch Polymers 0.000 description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005486 sulfidation Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 150000001722 carbon compounds Chemical class 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- AZUYLZMQTIKGSC-UHFFFAOYSA-N 1-[6-[4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-3-(1-methylindazol-5-yl)pyrazol-1-yl]-2-azaspiro[3.3]heptan-2-yl]prop-2-en-1-one Chemical compound ClC=1C(=C2C=NNC2=CC=1C)C=1C(=NN(C=1C)C1CC2(CN(C2)C(C=C)=O)C1)C=1C=C2C=NN(C2=CC=1)C AZUYLZMQTIKGSC-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000005539 carbonized material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000007806 chemical reaction intermediate Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 description 1
- ZNNZYHKDIALBAK-UHFFFAOYSA-M potassium thiocyanate Chemical compound [K+].[S-]C#N ZNNZYHKDIALBAK-UHFFFAOYSA-M 0.000 description 1
- 229940116357 potassium thiocyanate Drugs 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
- 150000003657 tungsten Chemical class 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- H01M4/9008—Organic or organo-metallic compounds
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inert Electrodes (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Catalysts (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Carbon And Carbon Compounds (AREA)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2108457A DE2108457C3 (de) | 1971-02-22 | 1971-02-22 | Verfahren zur Herstellung von pulverförmigem wolframhaltigem Elektrodenmaterial für elektrochemische Zellen |
| CA134,028A CA983000A (en) | 1971-02-22 | 1972-02-07 | Method for the manufacture of powdered tungsten containing electrode material |
| SE7201845A SE371941B (enExample) | 1971-02-22 | 1972-02-16 | |
| US00227309A US3784412A (en) | 1971-02-22 | 1972-02-17 | Method for the manufacture of powdered tungsten containing electrode material |
| GB7952/72*2A GB1367552A (en) | 1971-02-22 | 1972-02-21 | Manufacture of electrode materials |
| FR7205773A FR2126251B1 (enExample) | 1971-02-22 | 1972-02-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2108457A DE2108457C3 (de) | 1971-02-22 | 1971-02-22 | Verfahren zur Herstellung von pulverförmigem wolframhaltigem Elektrodenmaterial für elektrochemische Zellen |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2108457A1 DE2108457A1 (de) | 1972-09-07 |
| DE2108457B2 DE2108457B2 (de) | 1977-02-03 |
| DE2108457C3 true DE2108457C3 (de) | 1978-06-08 |
Family
ID=5799520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2108457A Expired DE2108457C3 (de) | 1971-02-22 | 1971-02-22 | Verfahren zur Herstellung von pulverförmigem wolframhaltigem Elektrodenmaterial für elektrochemische Zellen |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3784412A (enExample) |
| CA (1) | CA983000A (enExample) |
| DE (1) | DE2108457C3 (enExample) |
| FR (1) | FR2126251B1 (enExample) |
| GB (1) | GB1367552A (enExample) |
| SE (1) | SE371941B (enExample) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622215A (en) * | 1985-03-12 | 1986-11-11 | The United States Of America As Represented By The United States Department Of Energy | Process for preparing fine grain titanium carbide powder |
| GB8708604D0 (en) * | 1987-04-10 | 1987-05-13 | Grieveson P | Making carbides of high-melting metals |
| DE3814112A1 (de) * | 1987-08-13 | 1989-02-23 | Ts Lab Elektrochimitscheski Is | Vorrichtung zur rekombination von sich in bleiakkumulatoren ausscheidendem wasserstoff und sauerstoff |
| JP2615140B2 (ja) * | 1988-06-24 | 1997-05-28 | ソマール株式会社 | 超微粒子状金属を含有する多孔性炭素物の製造方法 |
| US6656870B2 (en) * | 2000-09-29 | 2003-12-02 | Osram Sylvania Inc. | Tungsten-containing fuel cell catalyst and method of making same |
| US7727927B2 (en) * | 2000-09-29 | 2010-06-01 | Global Tungsten & Powders Corp. | Method of making tungsten-containing fuel cell catalysts |
| US20220102737A1 (en) * | 2020-09-28 | 2022-03-31 | Hyzon Motors Inc. | Enhanced durability of fuel cell metallic bipolar plate |
| CN114875355B (zh) * | 2022-04-20 | 2023-08-18 | 西安致远航空科技有限公司 | 一种模具表面复合防护涂层的制备工艺 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3379647A (en) * | 1966-05-04 | 1968-04-23 | Carborundum Co | Metal carbide and boride production |
| US3573988A (en) * | 1968-12-23 | 1971-04-06 | Gen Electric | Electrode comprising non-noble metal disulfides or phosphides and electrochemical cell utilizing same |
-
1971
- 1971-02-22 DE DE2108457A patent/DE2108457C3/de not_active Expired
-
1972
- 1972-02-07 CA CA134,028A patent/CA983000A/en not_active Expired
- 1972-02-16 SE SE7201845A patent/SE371941B/xx unknown
- 1972-02-17 US US00227309A patent/US3784412A/en not_active Expired - Lifetime
- 1972-02-21 FR FR7205773A patent/FR2126251B1/fr not_active Expired
- 1972-02-21 GB GB7952/72*2A patent/GB1367552A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1367552A (en) | 1974-09-18 |
| CA983000A (en) | 1976-02-03 |
| US3784412A (en) | 1974-01-08 |
| FR2126251A1 (enExample) | 1972-10-06 |
| DE2108457B2 (de) | 1977-02-03 |
| FR2126251B1 (enExample) | 1975-10-24 |
| DE2108457A1 (de) | 1972-09-07 |
| SE371941B (enExample) | 1974-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| EF | Willingness to grant licences | ||
| 8339 | Ceased/non-payment of the annual fee |