ES2053826T3 - Preparacion de cuerpos fuertes de aluminio beta. - Google Patents
Preparacion de cuerpos fuertes de aluminio beta.Info
- Publication number
- ES2053826T3 ES2053826T3 ES89102149T ES89102149T ES2053826T3 ES 2053826 T3 ES2053826 T3 ES 2053826T3 ES 89102149 T ES89102149 T ES 89102149T ES 89102149 T ES89102149 T ES 89102149T ES 2053826 T3 ES2053826 T3 ES 2053826T3
- Authority
- ES
- Spain
- Prior art keywords
- alumina
- beta
- gel
- seed particles
- oxide
- 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 - Lifetime
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title 1
- 229910052782 aluminium Inorganic materials 0.000 title 1
- 229910000873 Beta-alumina solid electrolyte Inorganic materials 0.000 abstract 4
- 239000002245 particle Substances 0.000 abstract 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 3
- 229910001593 boehmite Inorganic materials 0.000 abstract 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 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 abstract 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 238000010304 firing Methods 0.000 abstract 1
- 229910052744 lithium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000010899 nucleation Methods 0.000 abstract 1
- 239000011591 potassium Substances 0.000 abstract 1
- 229910052700 potassium Inorganic materials 0.000 abstract 1
- 239000002243 precursor Substances 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/028—Beta-aluminas
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/111—Fine ceramics
- C04B35/113—Fine ceramics based on beta-aluminium oxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Ceramic Products (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
EL ESPOLVOREO DE COMPOSICIONES DE ALUMINIO TIPO BETA EN LAS QUE EL ALUMINIO EN LA MASA EN BRUTO ES BOEHMITA MICROCRISTALINA DA COMO RESULTADO UN INCREMENTO SIGNIFICATIVO EN SU DUREZA, DENSIDAD Y FUERZA, EN COMPARACION CON EL ALUMINIO BETA NO ESPOLVOREADO, CUANDO SE QUEMAN BAJO CONDICIONES SIMILARES. EL METODO COMPRENDE PROVEER A UNA COMPOSICION DE AL BETA ELEGIDO INCLUYENDO UN GEL DE BOEHMITA MICROCRISTALINO, UN OXIDO O UN PRECURSOR DE UN OXIDO DE NA, K, LI, MG, O CA Y UNAS PARTICULAS PULVERIZADAS SUBMICRONICAS DE AL ALFA O BETA, DICHAS PARTICULAS PULVERIZADAS ESTAN PRESENTES EN UNA CANTIDAD DE AL MENOS 0.1% EN PESO DE LOS SOLIDOS FINALES QUE CONTIENEN DICHO CUERPO, CON MOLDEO DE DICHO GEL Y SECADO Y CALENTAMIENTO A TEMPERATURAS ENTRE 1200 Y 1500 (GRADOS) C, CON LO QUE EL CUERPO SE CONVIERTE EN AL BETA, DICHAS PARTICULAS PULVERIZADAS ESTAN PRESENTES EN DICHO GEL EN UNA CANTIDAD DE AL MENOS EQUIVALENTE A 10 EXP 6 PARTICULAS POR CM3 DE PRODUCTO FINALIZADO CALENTADO.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/153,676 US4797269A (en) | 1988-02-08 | 1988-02-08 | Production of beta alumina by seeding and beta alumina produced thereby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2053826T3 true ES2053826T3 (es) | 1994-08-01 |
Family
ID=22548241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES89102149T Expired - Lifetime ES2053826T3 (es) | 1988-02-08 | 1989-02-08 | Preparacion de cuerpos fuertes de aluminio beta. |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US4797269A (es) |
| EP (1) | EP0328068B1 (es) |
| JP (1) | JPH0714812B2 (es) |
| KR (1) | KR0135762B1 (es) |
| AT (1) | ATE82950T1 (es) |
| AU (1) | AU611528B2 (es) |
| BR (1) | BR8900534A (es) |
| DE (1) | DE68903646T2 (es) |
| DK (1) | DK52689A (es) |
| ES (1) | ES2053826T3 (es) |
| MX (1) | MX165001B (es) |
| NO (1) | NO173307C (es) |
| NZ (1) | NZ227900A (es) |
| ZA (1) | ZA89443B (es) |
Families Citing this family (55)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5383945A (en) * | 1984-01-19 | 1995-01-24 | Norton Company | Abrasive material and method |
| JPH06104816B2 (ja) * | 1990-02-09 | 1994-12-21 | 日本研磨材工業株式会社 | 焼結アルミナ砥粒及びその製造方法 |
| US5415127A (en) * | 1993-07-07 | 1995-05-16 | Ontario Centre For Materials Research | Method of forming a single crystal film of sodium-beta "-alumina |
| US5401284A (en) * | 1993-07-30 | 1995-03-28 | Sheldon; David A. | Sol-gel alumina abrasive wheel with improved corner holding |
| US5536283A (en) * | 1993-07-30 | 1996-07-16 | Norton Company | Alumina abrasive wheel with improved corner holding |
| JP3667403B2 (ja) * | 1995-10-05 | 2005-07-06 | サンゴバン・ティーエム株式会社 | βアルミナ質電鋳耐火物 |
| US5711774A (en) * | 1996-10-09 | 1998-01-27 | Norton Company | Silicon carbide abrasive wheel |
| US6277161B1 (en) | 1999-09-28 | 2001-08-21 | 3M Innovative Properties Company | Abrasive grain, abrasive articles, and methods of making and using the same |
| US7939050B2 (en) * | 2008-05-19 | 2011-05-10 | General Electric Company | Composite article and related method |
| CN101717259B (zh) * | 2009-12-22 | 2012-03-07 | 中国科学院过程工程研究所 | 一种采用溶胶凝胶法制备Na-β＂-Al2O3固体电解质前驱体的方法 |
| EP2658680B1 (en) | 2010-12-31 | 2020-12-09 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive articles comprising abrasive particles having particular shapes and methods of forming such articles |
| WO2013003830A2 (en) | 2011-06-30 | 2013-01-03 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive articles including abrasive particles of silicon nitride |
| WO2013003831A2 (en) | 2011-06-30 | 2013-01-03 | Saint-Gobain Ceramics & Plastics, Inc. | Liquid phase sintered silicon carbide abrasive particles |
| US9517546B2 (en) | 2011-09-26 | 2016-12-13 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive articles including abrasive particulate materials, coated abrasives using the abrasive particulate materials and methods of forming |
| KR101404044B1 (ko) * | 2011-10-17 | 2014-06-10 | 건국대학교 산학협력단 | 슬립캐스팅 공정을 통하여 제작된 다공성 알루미나 프리폼으로부터 알칼리 용융염 함침에 의한 베타 알루미나 고체전해질 및 그 합성 방법 및 그 조성물로 이루어진 이차전지 |
| PL2797716T3 (pl) | 2011-12-30 | 2021-07-05 | Saint-Gobain Ceramics & Plastics, Inc. | Kompozytowe ukształtowane cząstki ścierne i sposób ich formowania |
| KR20140106737A (ko) | 2011-12-30 | 2014-09-03 | 생-고뱅 세라믹스 앤드 플라스틱스, 인코포레이티드 | 형상화 연마입자들 형성 |
| KR102074138B1 (ko) | 2011-12-30 | 2020-02-07 | 생-고뱅 세라믹스 앤드 플라스틱스, 인코포레이티드 | 형상화 연마입자 및 이의 형성방법 |
| US8840696B2 (en) | 2012-01-10 | 2014-09-23 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive particles having particular shapes and methods of forming such particles |
| EP2802436B1 (en) | 2012-01-10 | 2019-09-25 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive particles having complex shapes |
| KR101337407B1 (ko) * | 2012-03-15 | 2013-12-06 | 건국대학교 산학협력단 | 분무 건조 공정에서 베타알루미나 시드 첨가를 통한 베타알루미나 고체 전해질 제조 방법 및 그 조성물로 이루어진 이차전지 |
| WO2013149209A1 (en) | 2012-03-30 | 2013-10-03 | Saint-Gobain Abrasives, Inc. | Abrasive products having fibrillated fibers |
| KR101813466B1 (ko) | 2012-05-23 | 2017-12-29 | 생-고뱅 세라믹스 앤드 플라스틱스, 인코포레이티드 | 형상화 연마입자들 및 이의 형성방법 |
| WO2014005120A1 (en) | 2012-06-29 | 2014-01-03 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive particles having particular shapes and methods of forming such particles |
| EP2906392B1 (en) | 2012-10-15 | 2025-04-16 | Saint-Gobain Abrasives, Inc. | Abrasive particles having particular shapes and methods of forming such particles |
| CN104994995B (zh) | 2012-12-31 | 2018-12-14 | 圣戈本陶瓷及塑料股份有限公司 | 颗粒材料及其形成方法 |
| WO2014161001A1 (en) | 2013-03-29 | 2014-10-02 | Saint-Gobain Abrasives, Inc. | Abrasive particles having particular shapes and methods of forming such particles |
| CN104098118A (zh) * | 2013-04-15 | 2014-10-15 | 成都慧成科技有限责任公司 | 一种高离子通量β〞-Al2O3前驱粉体的制备方法 |
| TW201502263A (zh) | 2013-06-28 | 2015-01-16 | Saint Gobain Ceramics | 包含成形研磨粒子之研磨物品 |
| EP3044184B1 (de) * | 2013-09-12 | 2019-11-06 | Basf Se | Verfahren zur herstellung von beta-aluminiumoxidkeramik durch extrusion einer mischung enthaltend einer natriumverbindung |
| CN111978921A (zh) | 2013-09-30 | 2020-11-24 | 圣戈本陶瓷及塑料股份有限公司 | 成形磨粒及其形成方法 |
| KR102081045B1 (ko) | 2013-12-31 | 2020-02-26 | 생-고뱅 어브레이시브즈, 인코포레이티드 | 형상화 연마 입자들을 포함하는 연마 물품 |
| US9771507B2 (en) | 2014-01-31 | 2017-09-26 | Saint-Gobain Ceramics & Plastics, Inc. | Shaped abrasive particle including dopant material and method of forming same |
| CN103964822B (zh) * | 2014-04-02 | 2016-01-27 | 芜湖浙鑫新能源有限公司 | 一种采用溶胶凝胶法制备烧结Na-β"-Al2O3固体电解质前驱体的方法 |
| AU2015247739B2 (en) | 2014-04-14 | 2017-10-26 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive article including shaped abrasive particles |
| AU2015247826A1 (en) | 2014-04-14 | 2016-11-10 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive article including shaped abrasive particles |
| WO2015184355A1 (en) | 2014-05-30 | 2015-12-03 | Saint-Gobain Abrasives, Inc. | Method of using an abrasive article including shaped abrasive particles |
| US9914864B2 (en) | 2014-12-23 | 2018-03-13 | Saint-Gobain Ceramics & Plastics, Inc. | Shaped abrasive particles and method of forming same |
| US9707529B2 (en) | 2014-12-23 | 2017-07-18 | Saint-Gobain Ceramics & Plastics, Inc. | Composite shaped abrasive particles and method of forming same |
| US9676981B2 (en) | 2014-12-24 | 2017-06-13 | Saint-Gobain Ceramics & Plastics, Inc. | Shaped abrasive particle fractions and method of forming same |
| US10196551B2 (en) | 2015-03-31 | 2019-02-05 | Saint-Gobain Abrasives, Inc. | Fixed abrasive articles and methods of forming same |
| TWI634200B (zh) | 2015-03-31 | 2018-09-01 | 聖高拜磨料有限公司 | 固定磨料物品及其形成方法 |
| EP3307483B1 (en) | 2015-06-11 | 2020-06-17 | Saint-Gobain Ceramics&Plastics, Inc. | Abrasive article including shaped abrasive particles |
| KR102313436B1 (ko) | 2016-05-10 | 2021-10-19 | 생-고뱅 세라믹스 앤드 플라스틱스, 인코포레이티드 | 연마 입자들 및 그 형성 방법 |
| EP4071224A3 (en) | 2016-05-10 | 2023-01-04 | Saint-Gobain Ceramics and Plastics, Inc. | Methods of forming abrasive articles |
| EP4349896A3 (en) | 2016-09-29 | 2024-06-12 | Saint-Gobain Abrasives, Inc. | Fixed abrasive articles and methods of forming same |
| US10563105B2 (en) | 2017-01-31 | 2020-02-18 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive article including shaped abrasive particles |
| US10759024B2 (en) | 2017-01-31 | 2020-09-01 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive article including shaped abrasive particles |
| CN110719946B (zh) | 2017-06-21 | 2022-07-15 | 圣戈本陶瓷及塑料股份有限公司 | 颗粒材料及其形成方法 |
| WO2021133876A1 (en) | 2019-12-27 | 2021-07-01 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive articles and methods of forming same |
| EP4081370A4 (en) | 2019-12-27 | 2024-04-24 | Saint-Gobain Ceramics & Plastics Inc. | ABRASIVE ARTICLES AND THEIR FORMATION PROCESSES |
| US11926019B2 (en) | 2019-12-27 | 2024-03-12 | Saint-Gobain Ceramics & Plastics, Inc. | Abrasive articles and methods of forming same |
| EP4457054A4 (en) | 2021-12-30 | 2026-01-14 | Saint Gobain Abrasives Inc | ABRASIVE ARTICLES AND THEIR FORMATION PROCESSES |
| MX2024007593A (es) | 2021-12-30 | 2024-08-20 | Saint Gobain Abrasives Inc | Artículos abrasivos y métodos de formación de los mismos. |
| CN118591436A (zh) | 2021-12-30 | 2024-09-03 | 圣戈班磨料磨具有限公司 | 磨料制品及其形成方法 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US189A (en) * | 1837-05-08 | Turkabout bob railroads | ||
| US3859427A (en) * | 1969-11-10 | 1975-01-07 | Aluminum Co Of America | Production of beta alumina |
| GB1386244A (en) * | 1971-07-26 | 1975-03-05 | Atomic Energy Authority Uk | Beta-alumina |
| US3917462A (en) * | 1974-07-26 | 1975-11-04 | Union Carbide Corp | Method of producing sodium beta-alumina single crystals |
| US4013477A (en) * | 1975-07-30 | 1977-03-22 | The University Of Utah | Method for preparing dense, β-alumina ceramic bodies |
| US4339511A (en) * | 1979-11-30 | 1982-07-13 | The United States Of America As Represented By The United States Department Of Energy | Preparation of powders suitable for conversion to useful β-aluminas |
| US4543107A (en) * | 1984-08-08 | 1985-09-24 | Norton Company | Vitrified bonded grinding wheels containing sintered gel aluminous abrasive grits |
| US4623364A (en) * | 1984-03-23 | 1986-11-18 | Norton Company | Abrasive material and method for preparing the same |
| USH189H (en) | 1985-07-16 | 1987-01-06 | Norton Company | Process for production of alpha alumina bodies by sintering seeded boehmite made from alumina hydrates |
| US4657754A (en) * | 1985-11-21 | 1987-04-14 | Norton Company | Aluminum oxide powders and process |
| US4615875A (en) * | 1986-02-03 | 1986-10-07 | Allied Corporation | Process for preparing high purity alpha-alumina |
-
1988
- 1988-02-08 US US07/153,676 patent/US4797269A/en not_active Expired - Lifetime
-
1989
- 1989-01-19 ZA ZA89443A patent/ZA89443B/xx unknown
- 1989-01-31 NO NO890396A patent/NO173307C/no not_active IP Right Cessation
- 1989-02-01 JP JP1020940A patent/JPH0714812B2/ja not_active Expired - Lifetime
- 1989-02-03 DK DK052689A patent/DK52689A/da not_active Application Discontinuation
- 1989-02-03 BR BR898900534A patent/BR8900534A/pt not_active IP Right Cessation
- 1989-02-04 KR KR1019890001317A patent/KR0135762B1/ko not_active Expired - Lifetime
- 1989-02-07 MX MX14809A patent/MX165001B/es unknown
- 1989-02-08 DE DE8989102149T patent/DE68903646T2/de not_active Expired - Lifetime
- 1989-02-08 AT AT89102149T patent/ATE82950T1/de not_active IP Right Cessation
- 1989-02-08 EP EP89102149A patent/EP0328068B1/en not_active Expired - Lifetime
- 1989-02-08 NZ NZ227900A patent/NZ227900A/en unknown
- 1989-02-08 ES ES89102149T patent/ES2053826T3/es not_active Expired - Lifetime
- 1989-02-08 AU AU29759/89A patent/AU611528B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DK52689D0 (da) | 1989-02-03 |
| ATE82950T1 (de) | 1992-12-15 |
| NO890396D0 (no) | 1989-01-31 |
| JPH0714812B2 (ja) | 1995-02-22 |
| KR0135762B1 (ko) | 1997-06-17 |
| KR890013679A (ko) | 1989-09-25 |
| EP0328068A1 (en) | 1989-08-16 |
| NO890396L (no) | 1989-08-09 |
| JPH01226717A (ja) | 1989-09-11 |
| US4797269A (en) | 1989-01-10 |
| EP0328068B1 (en) | 1992-12-02 |
| DE68903646D1 (de) | 1993-01-14 |
| DK52689A (da) | 1989-08-09 |
| MX165001B (es) | 1992-10-13 |
| AU2975989A (en) | 1989-08-10 |
| ZA89443B (en) | 1989-10-25 |
| NZ227900A (en) | 1991-03-26 |
| BR8900534A (pt) | 1989-10-03 |
| NO173307C (no) | 1993-11-24 |
| DE68903646T2 (de) | 1993-04-08 |
| NO173307B (no) | 1993-08-16 |
| AU611528B2 (en) | 1991-06-13 |
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