ZA962559B - Mold material with additives. - Google Patents

Mold material with additives.

Info

Publication number
ZA962559B
ZA962559B ZA9602559A ZA962559A ZA962559B ZA 962559 B ZA962559 B ZA 962559B ZA 9602559 A ZA9602559 A ZA 9602559A ZA 962559 A ZA962559 A ZA 962559A ZA 962559 B ZA962559 B ZA 962559B
Authority
ZA
South Africa
Prior art keywords
mold
additives
mold material
making contact
mold assembly
Prior art date
Application number
ZA9602559A
Other languages
English (en)
Inventor
Ture Kindt-Larsen
Jeffrey Longo
Keith O'brien
Original Assignee
Johnson & Johnson Vision Prod
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
Application filed by Johnson & Johnson Vision Prod filed Critical Johnson & Johnson Vision Prod
Publication of ZA962559B publication Critical patent/ZA962559B/xx

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/06—Polystyrene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/40—Plastics, e.g. foam or rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • B29C33/64—Silicone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00038—Production of contact lenses
    • B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
    • B29D11/00192—Demoulding, e.g. separating lenses from mould halves
    • B29D11/00221—Demoulding, e.g. separating lenses from mould halves using prying means
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/005—Using a particular environment, e.g. sterile fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0888—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • B29L2011/0041—Contact lenses
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes
    • 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
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/808—Lens mold

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Eyeglasses (AREA)
  • Mold Materials And Core Materials (AREA)
  • Processing Of Solid Wastes (AREA)
ZA9602559A 1995-03-31 1996-03-29 Mold material with additives. ZA962559B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/414,999 US5690865A (en) 1995-03-31 1995-03-31 Mold material with additives

Publications (1)

Publication Number Publication Date
ZA962559B true ZA962559B (en) 1997-12-29

Family

ID=23643928

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA9602559A ZA962559B (en) 1995-03-31 1996-03-29 Mold material with additives.

Country Status (22)

Country Link
US (1) US5690865A (ja)
EP (1) EP0735092B1 (ja)
JP (1) JP3764778B2 (ja)
KR (1) KR100470261B1 (ja)
CN (1) CN1102612C (ja)
AT (1) ATE248893T1 (ja)
AU (1) AU697651B2 (ja)
BR (1) BR9601191A (ja)
CA (1) CA2173094C (ja)
DE (1) DE69629745T2 (ja)
DK (1) DK0735092T3 (ja)
ES (1) ES2204997T3 (ja)
HU (1) HUP9600828A3 (ja)
IL (1) IL117584A0 (ja)
MX (1) MX9601229A (ja)
NO (1) NO961282L (ja)
NZ (1) NZ286250A (ja)
PT (1) PT735092E (ja)
SG (1) SG54267A1 (ja)
SI (1) SI0735092T1 (ja)
TW (1) TW519547B (ja)
ZA (1) ZA962559B (ja)

Families Citing this family (37)

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US5849209A (en) * 1995-03-31 1998-12-15 Johnson & Johnson Vision Products, Inc. Mold material made with additives
US6822016B2 (en) 2001-09-10 2004-11-23 Johnson & Johnson Vision Care, Inc. Biomedical devices containing internal wetting agents
US7052131B2 (en) 2001-09-10 2006-05-30 J&J Vision Care, Inc. Biomedical devices containing internal wetting agents
EP1075369A1 (en) * 1998-04-28 2001-02-14 Kao Corporation Process for producing molded article
US6241918B1 (en) 1998-12-28 2001-06-05 Johnson & Johnson Vision Care, Inc. Process of manufacturing contact lenses in ambient environment
US7314591B2 (en) 2001-05-11 2008-01-01 Stratasys, Inc. Method for three-dimensional modeling
EP1194273B1 (en) 1999-06-11 2003-02-19 Bausch & Lomb Incorporated Lens molds with protective coatings for production of contact lenses and intraocular lenses
DE10003248B4 (de) † 2000-01-26 2008-05-29 Brockhues Gmbh & Co. Kg Pigmentgranulat zur Einfärbung von unpolaren Medien sowie Verfahren zu dessen Herstellung
US6551531B1 (en) * 2000-03-22 2003-04-22 Johnson & Johnson Vision Care, Inc. Molds for making ophthalmic devices
US6695817B1 (en) 2000-07-11 2004-02-24 Icu Medical, Inc. Medical valve with positive flow characteristics
US6663801B2 (en) * 2001-04-06 2003-12-16 Johnson & Johnson Vision Care, Inc. Silicon carbide IR-emitter heating device and method for demolding lenses
DE10393129T5 (de) * 2002-08-16 2005-09-01 Johnson & Johnson Vision Care, Inc., Jacksonville Formen für die Herstellung von Kontaktlinsen
US20080131593A1 (en) * 2004-01-29 2008-06-05 Powell P Mark Contact lens mold printing systems and processes
JP2008518719A (ja) 2004-11-05 2008-06-05 アイシーユー メディカル インコーポレイテッド 医療用ソフトグリップ・コネクタ
US7799249B2 (en) * 2005-08-09 2010-09-21 Coopervision International Holding Company, Lp Systems and methods for producing silicone hydrogel contact lenses
US20070037897A1 (en) * 2005-08-12 2007-02-15 Guigui Wang Method for making contact lenses
EP1996967A1 (en) * 2006-03-20 2008-12-03 CooperVision International Holding Company, LP Demolding aids for silicone hydrogels and related methods
US20070267765A1 (en) * 2006-05-18 2007-11-22 Ansell Scott F Biomedical device mold
US20070284770A1 (en) * 2006-06-07 2007-12-13 Ansell Scott F Decreased lens delamination during ophthalmic lens manufacture
US20080246171A1 (en) * 2006-09-27 2008-10-09 Berckmiller Gregory L Chilled injection molding during ophthalmic lens manufacture
CN101522252B (zh) 2006-10-25 2011-12-28 Icu医学有限公司 医用连接器
US20090121370A1 (en) * 2007-10-26 2009-05-14 Bausch & Lomb Incorporated Molds for Production of Ophthalmic Devices
US8262952B2 (en) * 2007-10-31 2012-09-11 Bausch & Lomb Incorporated Molds for production of ophthalmic devices
DE602008006421D1 (de) * 2008-11-06 2011-06-01 Clariant Finance Bvi Ltd Verfahren zur Herstellung von organischen polymerischen Profilen
US8454579B2 (en) 2009-03-25 2013-06-04 Icu Medical, Inc. Medical connector with automatic valves and volume regulator
US20100279903A1 (en) * 2009-04-30 2010-11-04 Honeywell International Inc. Metal Salts Of Oxidized Low Molecular Byproduct Polyethylene As Lubricants For PVC
USD644731S1 (en) 2010-03-23 2011-09-06 Icu Medical, Inc. Medical connector
US8758306B2 (en) 2010-05-17 2014-06-24 Icu Medical, Inc. Medical connectors and methods of use
WO2012064699A1 (en) 2010-11-10 2012-05-18 Novartis Ag Method for making contact lenses
SG190061A1 (en) 2010-12-01 2013-06-28 Novartis Ag Lens molds having atmospheric plasma coatings thereon
CN103958167B (zh) 2011-11-29 2017-03-08 诺华股份有限公司 用于模制眼用透镜的模具的至少一个半模的透镜成形表面的处理方法
US9034059B2 (en) 2012-04-11 2015-05-19 The Yankee Candle Company, Inc. Wax compositions including a slip agent
US9581832B2 (en) * 2013-03-15 2017-02-28 Johnson & Johnson Vision Care, Inc. Method and apparatus for encapsulating a rigid insert in a contact lens for correcting vision in astigmatic patients
WO2015088862A1 (en) 2013-12-11 2015-06-18 Icu Medical, Inc. Check valve
CN104004280B (zh) * 2014-05-20 2017-01-25 滁州迪蒙德模具制造有限公司 一种含热塑性树脂的塑料模具的制造方法
USD786427S1 (en) 2014-12-03 2017-05-09 Icu Medical, Inc. Fluid manifold
USD793551S1 (en) 2014-12-03 2017-08-01 Icu Medical, Inc. Fluid manifold

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US3424607A (en) * 1964-06-15 1969-01-28 Kalb Ind Inc De Atactic polyolefin release agents
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US3423488A (en) * 1966-05-11 1969-01-21 Ppg Industries Inc Process for casting resinous lenses in thermoplastic cast replica molds
US3821333A (en) * 1973-03-21 1974-06-28 American Optical Corp Gasket for lens mold from a blend of epdm and ethylene/vinyl acetate copolymer
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US4159292A (en) * 1977-05-25 1979-06-26 Neefe Optical Lab. Inc. Method of controlling the release of a cast plastic lens from a resinous lens mold
FR2449522A1 (fr) * 1979-02-20 1980-09-19 Essilor Int Procede de moulage, et moule correspondant, notamment pour moulage de lentilles ophtalmiques en matiere organique
US4565348A (en) * 1981-04-30 1986-01-21 Mia-Lens Production A/S Mold for making contact lenses, the male mold member being more flexible than the female mold member
CS239282B1 (en) * 1983-08-17 1986-01-16 Otto Wichterle Preparation method of objects made from hydrophilic gelsnamely contact lences by polymer casting
JPS6232010A (ja) * 1985-08-01 1987-02-12 Toray Ind Inc プラスチツクレンズ成型用モ−ルド
US4622347A (en) * 1986-04-07 1986-11-11 Atlantic Richfield Company Expandable polypropylene interpolymer particles
JPH01315444A (ja) * 1988-06-16 1989-12-20 Mitsubishi Gas Chem Co Inc 可撓性モデル材
US5158717A (en) * 1990-11-27 1992-10-27 Bausch & Lomb Incorporated Method of molding shaped polymeric articles
DE4207898A1 (de) * 1992-03-12 1993-09-16 Huels Chemische Werke Ag Form zur herstellung von latexschaumstoff
US5294379A (en) * 1992-09-18 1994-03-15 Johnson & Johnson Vision Products, Inc. Laser assisted demolding of ophthalmic lenses
JPH06155489A (ja) * 1992-11-02 1994-06-03 Nikon Corp プラスチックレンズ製造方法およびプラスチックレンズ製造用鋳型のスペーサ

Also Published As

Publication number Publication date
EP0735092A3 (en) 1997-10-15
HU9600828D0 (en) 1996-05-28
MX9601229A (es) 1997-04-30
JPH08318536A (ja) 1996-12-03
KR100470261B1 (ko) 2005-05-24
NZ286250A (en) 1997-08-22
EP0735092A2 (en) 1996-10-02
HUP9600828A3 (en) 1998-04-28
SG54267A1 (en) 1998-11-16
CN1141317A (zh) 1997-01-29
EP0735092B1 (en) 2003-09-03
CA2173094A1 (en) 1996-10-01
CA2173094C (en) 2007-06-26
NO961282L (no) 1996-10-01
PT735092E (pt) 2004-01-30
ES2204997T3 (es) 2004-05-01
DK0735092T3 (da) 2003-12-29
NO961282D0 (no) 1996-03-29
DE69629745T2 (de) 2004-07-01
JP3764778B2 (ja) 2006-04-12
AU697651B2 (en) 1998-10-15
TW519547B (en) 2003-02-01
BR9601191A (pt) 1998-01-06
ATE248893T1 (de) 2003-09-15
KR960033717A (ko) 1996-10-22
DE69629745D1 (de) 2003-10-09
IL117584A0 (en) 1996-07-23
US5690865A (en) 1997-11-25
AU5039396A (en) 1996-10-10
CN1102612C (zh) 2003-03-05
SI0735092T1 (en) 2004-02-29
HUP9600828A2 (en) 1996-12-30

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