ES2056394T3 - Microesferas ceramicas. - Google Patents
Microesferas ceramicas.Info
- Publication number
- ES2056394T3 ES2056394T3 ES90314167T ES90314167T ES2056394T3 ES 2056394 T3 ES2056394 T3 ES 2056394T3 ES 90314167 T ES90314167 T ES 90314167T ES 90314167 T ES90314167 T ES 90314167T ES 2056394 T3 ES2056394 T3 ES 2056394T3
- Authority
- ES
- Spain
- Prior art keywords
- micrometers
- microsphere
- range
- particle size
- size less
- 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
- 239000004005 microsphere Substances 0.000 title abstract 4
- 239000000919 ceramic Substances 0.000 title 1
- 239000002245 particle Substances 0.000 abstract 3
- 229910001570 bauxite Inorganic materials 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
Classifications
-
- 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
-
- 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
- C04B35/16—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 silicates other than clay
- C04B35/18—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 silicates other than clay rich in aluminium oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
-
- 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
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
-
- 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
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12486—Laterally noncoextensive components [e.g., embedded, etc.]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Powder Metallurgy (AREA)
- Cosmetics (AREA)
- Detergent Compositions (AREA)
Abstract
UNA MICROESFERA CALCINADA DE PARTICULAS ULTRAFINAS DE BAUXITA CON PARTICULAS DE TAMAÑO MEDIO ENTRE 0.01 Y 0.3 MICRAS, ESTA MICROESFERA TIENE PARTICULAS DE TAMAÑO MENOR DE 30 MICRAS Y ESTA CARACTERIZADA POR UNA FORMA SUSTANCIALMENTE SOLIDA CON UNA DENSIDAD PICNOMETRICA ENTRE 3.2 Y 3.9 G/CM ELEVADO 3, UN AREA DE SUPERFICIE BET ENTRE 0.05 Y 0.5 M (AL CUADRADO) /G Y UN GRANO DE CRISTAL CON UN TAMAÑO MENOR DE 4 MICRAS, LA QUIMICA DE LA SUPERFICIE DE LA MICROESFERA SE MODIFICA PARA AUMENTAR LA HUMECTABILIDAD DE LA MICROESFERA Y SU CAPACIDAD PARA UNIRSE FIRMEMENTE CON LOS MATERIALES DE MATRIZ EN USO.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPJ800989 | 1989-12-22 | ||
AUPK004590 | 1990-05-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2056394T3 true ES2056394T3 (es) | 1994-10-01 |
Family
ID=25643797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES90314167T Expired - Lifetime ES2056394T3 (es) | 1989-12-22 | 1990-12-21 | Microesferas ceramicas. |
Country Status (14)
Country | Link |
---|---|
US (1) | US5175133A (es) |
EP (1) | EP0434461B1 (es) |
JP (1) | JPH04263002A (es) |
KR (1) | KR0154119B1 (es) |
CN (1) | CN1056674A (es) |
AT (1) | ATE108425T1 (es) |
BR (1) | BR9006590A (es) |
CA (1) | CA2033131A1 (es) |
DE (1) | DE69010646T2 (es) |
ES (1) | ES2056394T3 (es) |
IE (1) | IE904650A1 (es) |
NZ (1) | NZ236638A (es) |
TW (1) | TW235290B (es) |
WO (1) | WO1991009815A1 (es) |
Families Citing this family (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3102205B2 (ja) * | 1993-05-13 | 2000-10-23 | トヨタ自動車株式会社 | アルミニウム合金製摺動部材 |
US7426961B2 (en) * | 2002-09-03 | 2008-09-23 | Bj Services Company | Method of treating subterranean formations with porous particulate materials |
JP2002079744A (ja) * | 2000-09-07 | 2002-03-19 | Canon Inc | 記録媒体とその製造方法およびそれを用いた画像形成方法 |
US6372678B1 (en) | 2000-09-28 | 2002-04-16 | Fairmount Minerals, Ltd | Proppant composition for gas and oil well fracturing |
US8062098B2 (en) | 2000-11-17 | 2011-11-22 | Duescher Wayne O | High speed flat lapping platen |
US8545583B2 (en) | 2000-11-17 | 2013-10-01 | Wayne O. Duescher | Method of forming a flexible abrasive sheet article |
US7632434B2 (en) | 2000-11-17 | 2009-12-15 | Wayne O. Duescher | Abrasive agglomerate coated raised island articles |
US8256091B2 (en) | 2000-11-17 | 2012-09-04 | Duescher Wayne O | Equal sized spherical beads |
US7520800B2 (en) | 2003-04-16 | 2009-04-21 | Duescher Wayne O | Raised island abrasive, lapping apparatus and method of use |
CA2328285A1 (fr) | 2000-12-15 | 2002-06-15 | Gauthier, Alain | Blindage anti projectile a charge creuse |
US7036591B2 (en) * | 2002-10-10 | 2006-05-02 | Carbo Ceramics Inc. | Low density proppant |
WO2004083600A1 (en) | 2003-03-18 | 2004-09-30 | Bj Services Company | Method of treating subterranean formations using mixed density proppants or sequential proppant stages |
US20050244641A1 (en) * | 2004-04-12 | 2005-11-03 | Carbo Ceramics Inc. | Coating and/or treating hydraulic fracturing proppants to improve wettability, proppant lubrication, and/or to reduce damage by fracturing fluids and reservoir fluids |
US7073476B2 (en) * | 2004-06-16 | 2006-07-11 | Honda Motor Co., Ltd. | Cylinder block |
WO2006010036A2 (en) | 2004-07-09 | 2006-01-26 | Carbo Ceramics, Inc. | Method for producing solid ceramic particles |
WO2006032008A2 (en) * | 2004-09-14 | 2006-03-23 | Carbo Ceramics Inc. | Sintered spherical pellets |
EA011732B1 (ru) | 2005-03-01 | 2009-04-28 | Карбо Керамикс Инк. | Способы получения спеченных частиц из суспензии содержащего оксид алюминия исходного материала |
US20070023187A1 (en) * | 2005-07-29 | 2007-02-01 | Carbo Ceramics Inc. | Sintered spherical pellets useful for gas and oil well proppants |
DE102005045180B4 (de) | 2005-09-21 | 2007-11-15 | Center For Abrasives And Refractories Research & Development C.A.R.R.D. Gmbh | Kugelförmige Korundkörner auf Basis von geschmolzenem Aluminiumoxid sowie ein Verfahren zu ihrer Herstellung |
CN101291885A (zh) * | 2005-10-19 | 2008-10-22 | 卡博陶粒有限公司 | 低热膨胀铸造介质 |
US7828998B2 (en) | 2006-07-11 | 2010-11-09 | Carbo Ceramics, Inc. | Material having a controlled microstructure, core-shell macrostructure, and method for its fabrication |
US8063000B2 (en) | 2006-08-30 | 2011-11-22 | Carbo Ceramics Inc. | Low bulk density proppant and methods for producing the same |
US8562900B2 (en) | 2006-09-01 | 2013-10-22 | Imerys | Method of manufacturing and using rod-shaped proppants and anti-flowback additives |
US20080087136A1 (en) * | 2006-10-13 | 2008-04-17 | Ek Roger B | Ferrosilicate proppant and granule composition |
EA201000114A1 (ru) | 2007-07-06 | 2010-06-30 | Карбо Керамикс Инк. | Проппант и способ гидравлического разрыва пласта (варианты) |
US7950455B2 (en) | 2008-01-14 | 2011-05-31 | Baker Hughes Incorporated | Non-spherical well treating particulates and methods of using the same |
IL192894A0 (en) * | 2008-07-17 | 2011-08-01 | Moshe Ravid | Armor panel |
US8205675B2 (en) * | 2008-10-09 | 2012-06-26 | Baker Hughes Incorporated | Method of enhancing fracture conductivity |
AU2014200669B2 (en) * | 2008-10-31 | 2015-11-19 | Saint-Gobain Ceramics & Plastics, Inc. | High strength proppants |
US8283271B2 (en) * | 2008-10-31 | 2012-10-09 | Saint-Gobain Ceramics & Plastics, Inc. | High strength proppants |
DE102011014498B4 (de) | 2011-03-18 | 2013-04-25 | Outotec Oyj | Verfahren zur Herstellung eines Klinkerersatzstoffes, Klinkerersatzstoff, Verwendung des Klinkerersatzstoffs, Zementklinker, Zement, Mörtel oder Beton, Verfahren zur Herstellung des Zementklinkers oder eines Baustoffs und Bauwerk |
US9920610B2 (en) | 2012-06-26 | 2018-03-20 | Baker Hughes, A Ge Company, Llc | Method of using diverter and proppant mixture |
US10041327B2 (en) | 2012-06-26 | 2018-08-07 | Baker Hughes, A Ge Company, Llc | Diverting systems for use in low temperature well treatment operations |
US9033040B2 (en) | 2011-12-16 | 2015-05-19 | Baker Hughes Incorporated | Use of composite of lightweight hollow core having adhered or embedded cement in cementing a well |
MX2014014757A (es) * | 2012-06-04 | 2015-04-13 | Imerys Oilfield Minerals Inc | Apuntaladores y aditivos contra el retorno del flujo que contienen arcilla calcinada en horno flash, metodos de fabricacion y metodos de uso. |
PL2864442T3 (pl) | 2012-06-26 | 2019-03-29 | Baker Hughes, A Ge Company, Llc | Sposoby ulepszania sieci szczelin hydraulicznych |
WO2014004689A2 (en) | 2012-06-26 | 2014-01-03 | Baker Hughes Incorporated | Method of using phthalic and terephthalic acids and derivatives thereof in well treatment operations |
US11111766B2 (en) | 2012-06-26 | 2021-09-07 | Baker Hughes Holdings Llc | Methods of improving hydraulic fracture network |
US10988678B2 (en) | 2012-06-26 | 2021-04-27 | Baker Hughes, A Ge Company, Llc | Well treatment operations using diverting system |
CN104685023B (zh) | 2012-08-01 | 2018-03-13 | 哈利伯顿能源服务公司 | 合成支撑剂和单分散支撑剂以及其制备方法 |
US9429006B2 (en) | 2013-03-01 | 2016-08-30 | Baker Hughes Incorporated | Method of enhancing fracture conductivity |
CA2849415C (en) | 2013-04-24 | 2017-02-28 | Robert D. Skala | Methods for fracturing subterranean formations |
CN103240402B (zh) * | 2013-05-17 | 2018-03-09 | 山西银光华盛镁业股份有限公司 | 一种颗粒增强铝基复合材料铸锭的生产方法 |
AU2015301423B2 (en) | 2014-08-15 | 2019-01-17 | Baker Hughes, A Ge Company, Llc | Diverting systems for use in well treatment operations |
WO2017091607A1 (en) | 2015-11-24 | 2017-06-01 | Premier Industries, LLC | System and method for forming spherical silica-based proppant and pig iron utilizing mining slag |
RU2619603C1 (ru) * | 2016-01-18 | 2017-05-17 | Акционерное общество "Боровичский комбинат огнеупоров" | Проппант и способ получения проппанта |
US11427507B2 (en) | 2016-12-31 | 2022-08-30 | Certainteed Llc | Mineral roofing granules and methods for making them |
DE102020200186A1 (de) | 2020-01-09 | 2021-07-15 | Thyssenkrupp Ag | Verfahren zur Wärmebehandlung und Farboptimierung von natürlichen Tonen |
BE1027979B1 (de) | 2020-01-09 | 2021-08-10 | Thyssenkrupp Ind Solutions Ag | Verfahren zur Wärmebehandlung und Farboptimierung von natürlichen Tonen |
ES2970550T3 (es) | 2020-01-09 | 2024-05-29 | thyssenkrupp Polysius GmbH | Dispositivo y procedimiento para el tratamiento térmico de sólidos minerales |
CN113249629B (zh) * | 2021-05-08 | 2022-06-10 | 中国科学院福建物质结构研究所 | 一种多孔金属衰减陶瓷及其制备方法和应用 |
CN114751767B (zh) * | 2022-04-07 | 2023-05-12 | 河南城建学院 | 一种用于超高性能混凝土内养护的多孔骨料及其制备方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3763603A (en) * | 1971-04-16 | 1973-10-09 | Norton Co | Aluminum oxide pressure blasting abrasives and method of making |
CA1045027A (en) * | 1975-09-26 | 1978-12-26 | Walter A. Hedden | Hydraulic fracturing method using sintered bauxite propping agent |
US4440866A (en) * | 1980-07-07 | 1984-04-03 | A/S Niro Atomizer | Process for the production of sintered bauxite spheres |
US4427068A (en) * | 1982-02-09 | 1984-01-24 | Kennecott Corporation | Sintered spherical pellets containing clay as a major component useful for gas and oil well proppants |
US4879181B1 (en) * | 1982-02-09 | 1994-01-11 | Carbo Ceramics Inc. | Sintered spherical pellets containing clay as a major component useful for gas and oil well proppants |
US4623630A (en) * | 1982-02-09 | 1986-11-18 | Standard Oil Proppants Company | Use of uncalcined/partially calcined ingredients in the manufacture of sintered pellets useful for gas and oil well proppants |
US4894285B1 (en) * | 1982-02-09 | 1994-01-11 | Carbo Ceramics Inc. | Sintered spherical pellets containing clay as a major component useful for gas and oil well proppants |
US4668645A (en) * | 1984-07-05 | 1987-05-26 | Arup Khaund | Sintered low density gas and oil well proppants from a low cost unblended clay material of selected composition |
US4713203A (en) * | 1985-05-23 | 1987-12-15 | Comalco Aluminium Limited | Bauxite proppant |
US4639427A (en) * | 1985-06-28 | 1987-01-27 | Norton Company | Stress-corrosion resistant proppant for oil and gas wells |
NZ223964A (en) * | 1987-04-03 | 1991-02-26 | Comalco Alu | Filter containing sintered ultrafine bauxite particles for use with fluids at high temperatures |
US4921820A (en) * | 1989-01-17 | 1990-05-01 | Norton-Alcoa Proppants | Lightweight proppant for oil and gas wells and methods for making and using same |
CA2003526A1 (en) * | 1988-11-22 | 1990-05-22 | Thomad K. Smith | Ceramic microspheres |
-
1990
- 1990-12-21 ES ES90314167T patent/ES2056394T3/es not_active Expired - Lifetime
- 1990-12-21 AT AT90314167T patent/ATE108425T1/de not_active IP Right Cessation
- 1990-12-21 NZ NZ236638A patent/NZ236638A/xx unknown
- 1990-12-21 EP EP90314167A patent/EP0434461B1/en not_active Expired - Lifetime
- 1990-12-21 US US07/630,968 patent/US5175133A/en not_active Expired - Fee Related
- 1990-12-21 DE DE69010646T patent/DE69010646T2/de not_active Expired - Fee Related
- 1990-12-21 IE IE465090A patent/IE904650A1/en unknown
- 1990-12-22 KR KR1019900021532A patent/KR0154119B1/ko not_active IP Right Cessation
- 1990-12-22 CN CN91100740A patent/CN1056674A/zh active Pending
- 1990-12-24 WO PCT/AU1990/000609 patent/WO1991009815A1/en unknown
- 1990-12-24 CA CA002033131A patent/CA2033131A1/en not_active Abandoned
- 1990-12-25 JP JP2413795A patent/JPH04263002A/ja active Pending
- 1990-12-26 BR BR909006590A patent/BR9006590A/pt not_active Application Discontinuation
-
1991
- 1991-02-09 TW TW080101056A patent/TW235290B/zh active
Also Published As
Publication number | Publication date |
---|---|
WO1991009815A1 (en) | 1991-07-11 |
TW235290B (es) | 1994-12-01 |
JPH04263002A (ja) | 1992-09-18 |
ATE108425T1 (de) | 1994-07-15 |
NZ236638A (en) | 1992-02-25 |
KR0154119B1 (ko) | 1998-11-16 |
KR910011697A (ko) | 1991-08-07 |
US5175133A (en) | 1992-12-29 |
DE69010646D1 (de) | 1994-08-18 |
IE904650A1 (en) | 1991-07-17 |
CA2033131A1 (en) | 1991-11-10 |
BR9006590A (pt) | 1991-10-01 |
EP0434461B1 (en) | 1994-07-13 |
CN1056674A (zh) | 1991-12-04 |
EP0434461A1 (en) | 1991-06-26 |
DE69010646T2 (de) | 1994-11-10 |
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