ES2052107T3 - Proceso para el tratamiento termico de preforma de fibra de vidrio. - Google Patents
Proceso para el tratamiento termico de preforma de fibra de vidrio.Info
- Publication number
- ES2052107T3 ES2052107T3 ES90112460T ES90112460T ES2052107T3 ES 2052107 T3 ES2052107 T3 ES 2052107T3 ES 90112460 T ES90112460 T ES 90112460T ES 90112460 T ES90112460 T ES 90112460T ES 2052107 T3 ES2052107 T3 ES 2052107T3
- Authority
- ES
- Spain
- Prior art keywords
- porous glass
- gas
- proforma
- tube
- atmosphere
- 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
- 238000000034 method Methods 0.000 title abstract 5
- 238000010438 heat treatment Methods 0.000 title abstract 4
- 239000011152 fibreglass Substances 0.000 title 1
- 239000005373 porous glass Substances 0.000 abstract 5
- 239000007789 gas Substances 0.000 abstract 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 abstract 1
- 238000006297 dehydration reaction Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 abstract 1
- 150000002367 halogens Chemical class 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 abstract 1
- 238000000746 purification Methods 0.000 abstract 1
- 238000004017 vitrification Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
- C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/07—Impurity concentration specified
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/07—Impurity concentration specified
- C03B2201/075—Hydroxyl ion (OH)
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S65/00—Glass manufacturing
- Y10S65/15—Nonoxygen containing chalogenides
- Y10S65/16—Optical filament or fiber treatment with fluorine or incorporating fluorine in final product
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S65/00—Glass manufacturing
- Y10S65/90—Drying, dehydration, minimizing oh groups
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
- Glass Compositions (AREA)
Abstract
EL INVENTO SUMINISTRA UN PROCESO PARA LA DESHIDRATACION Y TRATAMIENTO DE PURIFICACION MEDIANTE EL CALENTADO DE UNA PROFORMA DE VIDRIO POROSA PARA OBTENER UNA FIBRA OPTICA. EL PROCESO COMPRENDE EL PASO DE LA PROFORMA DE VIDRIO POROSO A TRAVES DE UN TUBO DE MUFLA QUE TENGA UNA CAPA SIC EN AL MENOS UNA DE SUS SUPERFICIES INTERNAS A UNA TEMPERATURA ELEVADA BAJO UNA ATMOSFERA QUE COMPRENDA UN GAS INERTE Y UN GAS DE HALOGENUR DE SILICEO. EL INVENTO TAMBIEN SUMINISTRA UN PROCESO PARA EL TRATAMIENTO DE INTRODUCCION DE FLUOR MEDIANTE EL CALENTAMIENTO DE UNA PROFORMA DE VIDRIO POROSO QUE COMPRENDE EL PASO DE LA PROFORMA DE VIDRIO POROSO A TRAVES DE UN TUBO DE MUFLA QUE TENGA UNA CAPA SIC EN AL MENOS UNA DE SUS SUPERFICIES INTERIORES A UNA ALTA TEMPERATURA BAJO UNA ATMOSFERA QUE COMPRENDA UN GAS DE UN COMPUESTO DE FLUOR Y UN GAS INERTE; Y EL INVENTO TAMBIEN SUMINISTRA UN PROCESO PARA EL TRATAMIENTO DE VITRIFICACION MEDIANTE EL CALENTAMIENTO DE UNA PROFORMA DE VIDRIO POROSO DE UNA FIBRA OPTICA QUE COMPRENDE EL PASO DE LA PROFORMA, QUE HA SIDO PREVIAMENTE DESHIDRATADA Y PURIFICADA, A TRAVES DE UN TUBO DE MUFLA QUE TENGA UNA CAPA DE SIC SOBRE AL MENOS UNA DE SUS SUPERFICIES INTERIORES A UNA ELEVADA TEMPERATURA BAJO UN GAS DE LA ATMOSFERA.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16769589 | 1989-06-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2052107T3 true ES2052107T3 (es) | 1994-07-01 |
Family
ID=15854514
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES92119449T Expired - Lifetime ES2094265T3 (es) | 1989-06-29 | 1990-06-29 | Proceso para el tratamiento termico de una preforma de fibra de vidrio. |
ES90112460T Expired - Lifetime ES2052107T3 (es) | 1989-06-29 | 1990-06-29 | Proceso para el tratamiento termico de preforma de fibra de vidrio. |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES92119449T Expired - Lifetime ES2094265T3 (es) | 1989-06-29 | 1990-06-29 | Proceso para el tratamiento termico de una preforma de fibra de vidrio. |
Country Status (10)
Country | Link |
---|---|
US (2) | US5106401A (es) |
EP (2) | EP0529694B1 (es) |
JP (2) | JPH03131544A (es) |
CN (1) | CN1029952C (es) |
AU (2) | AU632336B2 (es) |
CA (1) | CA2019919A1 (es) |
DE (2) | DE69006940T2 (es) |
DK (2) | DK0529694T3 (es) |
ES (2) | ES2094265T3 (es) |
NO (1) | NO178022C (es) |
Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU626362B2 (en) * | 1988-12-29 | 1992-07-30 | Sumitomo Electric Industries, Ltd. | Furnace for producing high purity quartz glass preform |
US5259856A (en) * | 1989-09-06 | 1993-11-09 | Sumitomo Electric Industrial, Ltd. | Method of producing glass preform in furnace for heating glass |
CA2025880A1 (en) * | 1989-09-25 | 1991-03-26 | Ichiro Tsuchiya | Furnace for production of optical fiber preform |
DE4133173A1 (de) * | 1991-10-07 | 1993-04-22 | Rheydt Kabelwerk Ag | Verfahren zum herstellen einer vorform fuer optische fasern |
JP3175247B2 (ja) * | 1991-12-16 | 2001-06-11 | 住友電気工業株式会社 | 光ファイバ用多孔質母材の加熱透明化方法 |
JP3060782B2 (ja) * | 1993-06-08 | 2000-07-10 | 住友電気工業株式会社 | 高純度透明ガラスの製造方法 |
US5653779A (en) * | 1994-06-30 | 1997-08-05 | Heraeus Quarzglas Gmbh | Method for manufacturing quartz glass components and molding frame therefor |
JP3845906B2 (ja) * | 1996-08-09 | 2006-11-15 | 住友電気工業株式会社 | 合成シリカガラスの製造方法 |
EP0867412B1 (en) * | 1997-03-27 | 2001-03-07 | Alcatel | Thermal insulation of a furnace for drawing optical fibres |
KR20010031525A (ko) * | 1997-10-31 | 2001-04-16 | 알프레드 엘. 미첼슨 | 도파관 섬유 인발방법 및 장치 |
US6543257B1 (en) * | 1999-05-28 | 2003-04-08 | The Furukawa Electric Co., Ltd. | Dehydration and sintering apparatus for porous optical fiber preform |
KR100346112B1 (ko) * | 1999-12-22 | 2002-08-01 | 삼성전자 주식회사 | 솔-젤 공법을 채용한 광섬유 모재 제조공정의 소결공정에서 오버 자켓팅 튜브 소결장치 및 그 방법 |
DE10020033C2 (de) * | 2000-04-22 | 2003-04-03 | Heraeus Quarzglas | Vorrichtung zum Sintern eines Formkörpers |
JP4379554B2 (ja) * | 2000-09-01 | 2009-12-09 | 住友電気工業株式会社 | 光ファイバ母材の脱水焼結方法 |
JP2002154838A (ja) * | 2000-11-16 | 2002-05-28 | Shin Etsu Chem Co Ltd | 光ファイバ用ガラス母材の製造方法 |
WO2002049977A2 (en) * | 2000-12-20 | 2002-06-27 | Corning Incorporated | Method of doping an optical fiber preform with fluorine |
KR20030082606A (ko) * | 2001-02-24 | 2003-10-22 | 코닝 인코포레이티드 | 실리콘 옥시플루오라이드 유리의 산소 도핑 |
JP4043728B2 (ja) * | 2001-04-04 | 2008-02-06 | 古河電気工業株式会社 | 光ファイバ線引炉 |
US6606883B2 (en) * | 2001-04-27 | 2003-08-19 | Corning Incorporated | Method for producing fused silica and doped fused silica glass |
CN100345782C (zh) * | 2001-06-28 | 2007-10-31 | 古河电气工业株式会社 | 光纤预制体的制造方法以及烧结装置 |
US8037717B2 (en) * | 2001-10-26 | 2011-10-18 | Corning Incorporated | Methods and apparatus for pulsed doping or drying a soot preform |
JP2004002106A (ja) * | 2002-05-31 | 2004-01-08 | Shin Etsu Chem Co Ltd | 低損失光ファイバ母材とその製造方法 |
JP3970692B2 (ja) * | 2002-05-31 | 2007-09-05 | 信越化学工業株式会社 | プリフォーム製造方法 |
US20040057692A1 (en) * | 2002-08-28 | 2004-03-25 | Ball Laura J. | Low loss optical fiber and method for making same |
US6935050B2 (en) | 2002-12-04 | 2005-08-30 | Corning Incorporated | Method and apparatus reducing metal impurities in optical fiber soot preforms |
JP2004218956A (ja) * | 2003-01-16 | 2004-08-05 | Ngk Insulators Ltd | 基板の熱処理方法及び熱処理炉 |
KR101066281B1 (ko) | 2003-08-29 | 2011-09-20 | 코닝 인코포레이티드 | 알칼리 금속 산화물을 함유하는 광섬유, 및 그 제조 방법및 장치 |
US20050092231A1 (en) * | 2003-10-29 | 2005-05-05 | Hawtof Daniel W. | Method and apparatus for making crystals without a pre-melt step |
US7866189B2 (en) * | 2003-12-08 | 2011-01-11 | Fujikura Ltd. | Dehydration-sintering furnace, a manufacturing method of an optical fiber preform utilizing the furnace and an optical fiber preform manufactured by the method |
CN1317212C (zh) * | 2004-04-29 | 2007-05-23 | 斯德莱特光学技术有限公司 | 一种在1380nm波长区域内低衰减光纤及其制备方法 |
US20050257571A1 (en) * | 2004-05-18 | 2005-11-24 | The Furukawa Electric Co, Ltd. | Method and apparatus for manufacturing a glass preform |
US20060130530A1 (en) * | 2004-12-21 | 2006-06-22 | Anderson James G | Method of doping silica glass with an alkali metal, and optical fiber precursor formed therefrom |
CN101583891A (zh) * | 2005-11-23 | 2009-11-18 | 康宁股份有限公司 | 低衰减非零色散位移光纤 |
FR2903501B1 (fr) * | 2006-07-04 | 2008-08-22 | Draka Comteq France Sa | Fibre optique dopee au fluor |
US7848606B1 (en) | 2008-03-13 | 2010-12-07 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Eliminating crystals in non-oxide optical fiber preforms and optical fibers |
US20100122558A1 (en) * | 2008-11-19 | 2010-05-20 | John Michael Jewell | Apparatus and Method of Sintering an Optical Fiber Preform |
CN102348654B (zh) * | 2009-03-12 | 2014-09-17 | 株式会社藤仓 | 光纤母材的制造方法 |
JP5503339B2 (ja) * | 2009-03-16 | 2014-05-28 | 古河電気工業株式会社 | 多孔質ガラス母材の脱水焼結用加熱炉 |
JP2012188314A (ja) * | 2011-03-10 | 2012-10-04 | Shin-Etsu Chemical Co Ltd | フッ素含有光ファイバ母材の製造方法及びフッ素含有光ファイバ母材 |
US20130248510A1 (en) * | 2012-03-26 | 2013-09-26 | Binggang Weng | Electric heater capable of automatic heating |
JP6025604B2 (ja) * | 2013-02-21 | 2016-11-16 | 株式会社フジクラ | ガラス母材の製造装置 |
CN104529148B (zh) * | 2014-12-29 | 2017-04-12 | 长飞光纤光缆股份有限公司 | 一种光纤粉末疏松棒体的脱水装置及方法 |
CN104761138A (zh) * | 2015-03-16 | 2015-07-08 | 江苏通鼎光棒有限公司 | 一种用于vad和ovd疏松体烧结的装置和方法 |
CN106116121A (zh) * | 2016-08-31 | 2016-11-16 | 中国建筑材料科学研究总院 | 石英玻璃的制备方法及石英玻璃 |
JP6864641B2 (ja) * | 2018-03-20 | 2021-04-28 | 信越化学工業株式会社 | 光ファイバ用多孔質ガラス母材の焼結方法 |
IT201800009920A1 (it) | 2018-10-30 | 2020-04-30 | Prysmian Spa | Metodo per fabbricare una preforma di vetro per fibre ottiche |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3933454A (en) * | 1974-04-22 | 1976-01-20 | Corning Glass Works | Method of making optical waveguides |
US4125388A (en) * | 1976-12-20 | 1978-11-14 | Corning Glass Works | Method of making optical waveguides |
US4126436A (en) * | 1977-12-05 | 1978-11-21 | Corning Glass Works | Apparatus for minimizing drawn filament diameter variation |
US4298365A (en) * | 1980-07-03 | 1981-11-03 | Corning Glass Works | Method of making a soot preform compositional profile |
JPS5858299A (ja) * | 1981-09-30 | 1983-04-06 | Daido Steel Co Ltd | 金属電極 |
US4450333A (en) * | 1982-05-28 | 1984-05-22 | At&T Technologies, Inc. | Zirconia induction furnace |
JPS59184734A (ja) * | 1983-04-06 | 1984-10-20 | Furukawa Electric Co Ltd:The | 光学系多孔質ガラスの透明ガラス化法 |
US4629485A (en) * | 1983-09-26 | 1986-12-16 | Corning Glass Works | Method of making fluorine doped optical preform and fiber and resultant articles |
JPS60145923A (ja) * | 1984-01-05 | 1985-08-01 | Sumitomo Electric Ind Ltd | 光フアイバ用母材の製造装置 |
JPS60239337A (ja) * | 1984-05-15 | 1985-11-28 | Sumitomo Electric Ind Ltd | 光フアイバ−用ガラス母材の製造法 |
JPS6126522A (ja) * | 1984-07-12 | 1986-02-05 | Seiko Epson Corp | 石英ガラスの製造方法 |
CA1271316A (en) * | 1984-12-21 | 1990-07-10 | Koichi Abe | Optical waveguide manufacture |
JPS61201634A (ja) * | 1985-03-01 | 1986-09-06 | Sumitomo Electric Ind Ltd | 光フアイバ用母材の製造方法 |
JPS61215226A (ja) * | 1985-03-22 | 1986-09-25 | Furukawa Electric Co Ltd:The | 光学系ガラスス−ト用透明ガラス化炉 |
JPS62275035A (ja) * | 1985-05-07 | 1987-11-30 | Sumitomo Electric Ind Ltd | 光フアイバ用母材の製造方法 |
US4741748A (en) * | 1986-01-30 | 1988-05-03 | Corning Glass Works | Heating oven for preparing optical waveguide fibers |
AU593724B2 (en) * | 1987-02-16 | 1990-02-15 | Sumitomo Electric Industries, Ltd. | Furnace for heating glass preform for optical fiber and method for producing glass preform |
KR950014101B1 (ko) * | 1987-02-16 | 1995-11-21 | 스미토모덴기고교 가부시키가이샤 | 광섬유용 유리모재의 가열로와 그 유리모재의 제조방법 |
DE3711281C1 (de) * | 1987-04-03 | 1988-06-16 | Heraeus Schott Quarzschmelze | Verfahren zum Verglasen eines poroesen,aus Glasruss bestehenden Koerpers und Ofen zu dessen Durchfuehrung |
JPH01183430A (ja) * | 1988-01-14 | 1989-07-21 | Sumitomo Electric Ind Ltd | 多孔質光ファイバ母材の脱水焼結炉 |
JPH0269328A (ja) * | 1988-09-06 | 1990-03-08 | Sumitomo Electric Ind Ltd | 光ファイバ用母材の製造方法 |
-
1990
- 1990-05-25 JP JP2133863A patent/JPH03131544A/ja active Pending
- 1990-06-22 AU AU57747/90A patent/AU632336B2/en not_active Ceased
- 1990-06-26 JP JP2165549A patent/JPH04119939A/ja active Pending
- 1990-06-27 CA CA002019919A patent/CA2019919A1/en not_active Abandoned
- 1990-06-28 US US07/544,942 patent/US5106401A/en not_active Expired - Fee Related
- 1990-06-28 NO NO902897A patent/NO178022C/no unknown
- 1990-06-29 DE DE69006940T patent/DE69006940T2/de not_active Expired - Fee Related
- 1990-06-29 DE DE69028414T patent/DE69028414T2/de not_active Expired - Fee Related
- 1990-06-29 ES ES92119449T patent/ES2094265T3/es not_active Expired - Lifetime
- 1990-06-29 ES ES90112460T patent/ES2052107T3/es not_active Expired - Lifetime
- 1990-06-29 CN CN90103293A patent/CN1029952C/zh not_active Expired - Fee Related
- 1990-06-29 EP EP92119449A patent/EP0529694B1/en not_active Expired - Lifetime
- 1990-06-29 EP EP90112460A patent/EP0405580B1/en not_active Expired - Lifetime
- 1990-06-29 DK DK92119449.4T patent/DK0529694T3/da active
- 1990-06-29 DK DK90112460.2T patent/DK0405580T3/da active
-
1992
- 1992-06-15 AU AU18251/92A patent/AU645692B2/en not_active Ceased
- 1992-07-24 US US07/924,767 patent/US5306322A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
AU632336B2 (en) | 1992-12-24 |
EP0529694B1 (en) | 1996-09-04 |
US5306322A (en) | 1994-04-26 |
EP0405580A3 (en) | 1991-02-06 |
DE69028414T2 (de) | 1997-02-06 |
EP0529694A2 (en) | 1993-03-03 |
DE69006940T2 (de) | 1994-07-14 |
EP0529694A3 (en) | 1993-06-02 |
CN1048372A (zh) | 1991-01-09 |
DK0405580T3 (da) | 1994-03-28 |
AU1825192A (en) | 1992-08-06 |
EP0405580A2 (en) | 1991-01-02 |
EP0405580B1 (en) | 1994-03-02 |
CN1029952C (zh) | 1995-10-11 |
NO178022C (no) | 1996-01-10 |
CA2019919A1 (en) | 1990-12-29 |
US5106401A (en) | 1992-04-21 |
AU5774790A (en) | 1991-01-03 |
JPH03131544A (ja) | 1991-06-05 |
DE69028414D1 (de) | 1996-10-10 |
DE69006940D1 (de) | 1994-04-07 |
NO178022B (no) | 1995-10-02 |
DK0529694T3 (da) | 1996-12-02 |
NO902897L (no) | 1991-01-02 |
NO902897D0 (no) | 1990-06-28 |
ES2094265T3 (es) | 1997-01-16 |
JPH04119939A (ja) | 1992-04-21 |
AU645692B2 (en) | 1994-01-20 |
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