NO821043L - Optiske en-modulsfibre som fastholder polarisasjonen og fremgangsmaate for fremstilling av dem - Google Patents

Optiske en-modulsfibre som fastholder polarisasjonen og fremgangsmaate for fremstilling av dem

Info

Publication number
NO821043L
NO821043L NO821043A NO821043A NO821043L NO 821043 L NO821043 L NO 821043L NO 821043 A NO821043 A NO 821043A NO 821043 A NO821043 A NO 821043A NO 821043 L NO821043 L NO 821043L
Authority
NO
Norway
Prior art keywords
preparing
procedure
optical
fibers containing
containing polarization
Prior art date
Application number
NO821043A
Other languages
English (en)
Other versions
NO164139C (no
NO164139B (no
Inventor
Michael Gregg Blankenship
Donald Bruce Keck
Arnab Sarkar
Original Assignee
Corning Glass Works
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US06/249,022 external-priority patent/US4360371A/en
Priority claimed from US06/248,947 external-priority patent/US4415230A/en
Priority claimed from US06/253,224 external-priority patent/US4395270A/en
Application filed by Corning Glass Works filed Critical Corning Glass Works
Publication of NO821043L publication Critical patent/NO821043L/no
Publication of NO164139B publication Critical patent/NO164139B/no
Publication of NO164139C publication Critical patent/NO164139C/no

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/105Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C03B37/01217Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of polarisation-maintaining optical fibres
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/01446Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/01466Means for changing or stabilising the diameter or form of tubes or rods
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/01486Means for supporting, rotating or translating the preforms being formed, e.g. lathes
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/018Manufacture 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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/018Manufacture 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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01853Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/014Manufacture 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]
    • C03B37/018Manufacture 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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01861Means for changing or stabilising the diameter or form of tubes or rods
    • C03B37/01869Collapsing
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/02Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/02Pure silica glass, e.g. pure fused quartz
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/06Doped silica-based glasses
    • C03B2201/08Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
    • C03B2201/10Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/06Doped silica-based glasses
    • C03B2201/20Doped silica-based glasses doped with non-metals other than boron or fluorine
    • C03B2201/28Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/06Doped silica-based glasses
    • C03B2201/30Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C03B2201/31Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00Type of glass produced
    • C03B2201/06Doped silica-based glasses
    • C03B2201/30Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C03B2201/40Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn
    • C03B2201/42Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with transition metals other than rare earth metals, e.g. Zr, Nb, Ta or Zn doped with titanium
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00Fibre product details, e.g. structure, shape
    • C03B2203/10Internal structure or shape details
    • C03B2203/12Non-circular or non-elliptical cross-section, e.g. planar core
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00Fibre product details, e.g. structure, shape
    • C03B2203/30Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
    • C03B2203/31Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres by use of stress-imparting rods, e.g. by insertion

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
NO821043A 1981-03-30 1982-03-29 Optisk polarisasjonsbevarende fiber av enkeltboelgetypen samt fremgangsmaate for fremstilling av et utgangsemne til optisk fiber. NO164139C (no)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US06/249,022 US4360371A (en) 1981-03-30 1981-03-30 Method of making polarization retaining single-mode optical waveguide
US06/248,947 US4415230A (en) 1981-03-30 1981-03-30 Polarization retaining single-mode optical waveguide
US06/253,224 US4395270A (en) 1981-04-13 1981-04-13 Method of fabricating a polarization retaining single-mode optical waveguide

Publications (3)

Publication Number Publication Date
NO821043L true NO821043L (no) 1982-10-01
NO164139B NO164139B (no) 1990-05-21
NO164139C NO164139C (no) 1990-08-29

Family

ID=27400167

Family Applications (1)

Application Number Title Priority Date Filing Date
NO821043A NO164139C (no) 1981-03-30 1982-03-29 Optisk polarisasjonsbevarende fiber av enkeltboelgetypen samt fremgangsmaate for fremstilling av et utgangsemne til optisk fiber.

Country Status (12)

Country Link
EP (3) EP0145030A3 (no)
JP (1) JP2750345B2 (no)
KR (1) KR890000331B1 (no)
AU (1) AU546930B2 (no)
BR (1) BR8201562A (no)
CA (1) CA1177297A (no)
DE (1) DE3272823D1 (no)
DK (1) DK155474C (no)
ES (1) ES510635A0 (no)
FI (1) FI81209C (no)
MX (1) MX156655A (no)
NO (1) NO164139C (no)

Families Citing this family (29)

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DE3369675D1 (en) * 1982-06-25 1987-03-12 Nat Res Dev Method of making optical fibre preforms and optical fibre preform
US4529426A (en) * 1983-07-22 1985-07-16 At&T Bell Laboratories Method of fabricating high birefringence fibers
FR2551885B1 (fr) * 1983-09-13 1986-01-24 Thomson Csf Procede de fabrication d'une fibre optique multicoeurs et fibres optiques obtenues par un tel procede
US4630889A (en) * 1983-11-09 1986-12-23 Polaroid Corporation Polarization locked optical fiber and method
US4561871A (en) * 1983-12-27 1985-12-31 Corning Glass Works Method of making polarization preserving optical fiber
GB8400535D0 (en) * 1984-01-10 1984-02-15 Standard Telephones Cables Ltd Optical fibre manufacture
JPS6163538A (ja) * 1984-09-04 1986-04-01 Kokusai Denshin Denwa Co Ltd <Kdd> フッ化物ガラスの精製法
GB8612189D0 (en) * 1986-05-20 1986-07-16 Birch R D Optical fibre apparatus
US4781424A (en) * 1986-07-28 1988-11-01 Nippon Telegraph And Telephone Corporation Single mode channel optical waveguide with a stress-induced birefringence control region
JPS6360411A (ja) * 1986-09-01 1988-03-16 Hitachi Cable Ltd 偏波面保存光フアイバ
DE3641285A1 (de) * 1986-12-03 1988-06-09 Schott Glaswerke Verfahren zur messung von (alpha) und ss-strahlen geringer intensitaet
US4904052A (en) * 1987-04-28 1990-02-27 Hughes Aircraft Company Polarization preserving optical fiber and method of manufacturing
US4824455A (en) * 1987-04-28 1989-04-25 Hughes Aircraft Company Polarization preserving optical fiber and method of manufacturing
JPH0718964B2 (ja) * 1987-06-29 1995-03-06 日本電信電話株式会社 集積光デバイスおよびその製造方法
DE68912288T2 (de) * 1988-12-09 1994-05-05 Alcatel Nv Verfahren zum Verarbeiten einer Vorform für polarisationserhaltende optische Fasern.
FR2649690B1 (fr) * 1989-07-11 1994-01-28 Cie Generale D Electricite Procede de fabrication de preformes pour fibres optiques sans symetrie de revolution
FR2650584B1 (fr) * 1989-08-02 1993-12-17 Cie Generale D Electricite Procede de fabrication d'une fibre optique a gaine dopee
US5180410A (en) * 1990-07-30 1993-01-19 Corning Incorporated Method of making polarization retaining fiber
US5904762A (en) * 1997-04-18 1999-05-18 Cabot Corporation Method of making a multi-phase aggregate using a multi-stage process
US5895522A (en) * 1997-08-12 1999-04-20 Cabot Corporation Modified carbon products with leaving groups and inks and coatings containing modified carbon products
US6243522B1 (en) * 1998-12-21 2001-06-05 Corning Incorporated Photonic crystal fiber
WO2000060390A1 (en) * 1999-03-30 2000-10-12 Crystal Fibre A/S Polarisation preserving optical fibre
JP3986842B2 (ja) * 2001-07-26 2007-10-03 株式会社フジクラ ノンゼロ分散シフト光ファイバ用光ファイバ母材の製法
JP3833621B2 (ja) 2002-03-15 2006-10-18 株式会社フジクラ 偏波保持光ファイバ
CA2987108C (en) 2005-02-28 2018-07-31 Weatherford Technology Holdings, Llc Polarization controlling optical fiber preform and preform fabrication methods
US8326037B1 (en) 2005-11-23 2012-12-04 Matrox Electronic Systems, Ltd. Methods and apparatus for locating an object in an image
US8526773B2 (en) * 2010-04-30 2013-09-03 Corning Incorporated Optical fiber with differential birefringence mechanism
JP2016148806A (ja) * 2015-02-13 2016-08-18 株式会社中原光電子研究所 偏波保持光ファイバ、キャピラリ及びコネクタ
EP3136143B1 (en) * 2015-08-26 2020-04-01 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. Hollow-core fibre and method of manufacturing thereof

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US3278283A (en) * 1963-04-12 1966-10-11 American Optical Corp Method of making light-conducting optical component
US3535017A (en) * 1968-01-08 1970-10-20 Bell Telephone Labor Inc Optical fiber waveguide structures
US3678328A (en) * 1968-11-01 1972-07-18 Bendix Corp Channel multiplier assembly and method of manufacture thereof
US3823995A (en) * 1972-03-30 1974-07-16 Corning Glass Works Method of forming light focusing fiber waveguide
JPS50161255A (no) * 1974-06-18 1975-12-27
US4028082A (en) * 1976-02-10 1977-06-07 American Optical Corporation Method of making artificial intraocular lenses with holes
JPS52131735A (en) * 1976-04-28 1977-11-04 Sumitomo Electric Ind Ltd Manufacture of optical fiber
US4204851A (en) * 1977-06-23 1980-05-27 Corning Glass Works Directing glass forming constituents against a lateral surface parallel to the axis of rotation of a starting member to form a monolithic blank for an optical waveguide
NL193330C (nl) * 1978-01-13 1999-06-02 Western Electric Co Optische golfleider en werkwijze voor het vervaardigen daarvan.
US4165223A (en) * 1978-03-06 1979-08-21 Corning Glass Works Method of making dry optical waveguides
US4184859A (en) * 1978-06-09 1980-01-22 International Telephone And Telegraph Corporation Method of fabricating an elliptical core single mode fiber
US4229197A (en) * 1978-06-12 1980-10-21 International Telephone And Telegraph Corporation Method for making multiple optical core fiber
US4243298A (en) * 1978-10-06 1981-01-06 International Telephone And Telegraph Corporation High-strength optical preforms and fibers with thin, high-compression outer layers
DE2909390A1 (de) * 1979-03-09 1980-09-18 Siemens Ag Verfahren zur herstellung einer multikanal-lichtleitfaser
DE2930791A1 (de) * 1979-07-28 1981-02-12 Licentia Gmbh Verfahren zur herstellung einer lichtleitfaser
JPS5624306A (en) * 1979-08-03 1981-03-07 Sumitomo Electric Ind Ltd Production of optical fiber having elliptical core
EP0032390B1 (en) * 1980-01-11 1987-04-22 Hitachi, Ltd. Method of producing a preform rod for an optical fiber
GB2096788B (en) * 1981-01-17 1984-12-19 Nippon Telegraph & Telephone Single-polarization single-mode optical fibers

Also Published As

Publication number Publication date
CA1177297A (en) 1984-11-06
EP0145030A3 (en) 1985-07-10
FI81209B (fi) 1990-05-31
KR890000331B1 (ko) 1989-03-14
EP0145031A2 (en) 1985-06-19
JPH06174957A (ja) 1994-06-24
EP0145031A3 (en) 1985-07-10
DK122582A (da) 1982-10-01
AU546930B2 (en) 1985-09-26
DE3272823D1 (en) 1986-10-02
EP0061901B1 (en) 1986-08-27
NO164139C (no) 1990-08-29
AU8192182A (en) 1982-10-07
JP2750345B2 (ja) 1998-05-13
FI821088L (fi) 1982-10-01
BR8201562A (pt) 1983-02-08
NO164139B (no) 1990-05-21
DK155474C (da) 1989-10-09
DK155474B (da) 1989-04-10
EP0061901A1 (en) 1982-10-06
FI81209C (fi) 1990-09-10
KR830009492A (ko) 1983-12-21
FI821088A0 (fi) 1982-03-29
EP0145030A2 (en) 1985-06-19
MX156655A (es) 1988-09-22
EP0145031B1 (en) 1988-05-04
ES8302919A1 (es) 1983-02-01
ES510635A0 (es) 1983-02-01

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