Patent US4557562A successfully refreshed from Google Patents.
US4557562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers for optical fibers
Assignee: Daikin Industries Ltd
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Filing: 1984-09-17
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Granted: 1985-12-10
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Expires: 2004-09-17
Abstract
Abstract A copolymer for optical fibers of fluoroalkylmethacrylate and acrylic acid.
Inventors
- 👤 Akira Ohmori
- 👤 Nobuyuki Tomihashi
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/22; G; G02; G02B; G02B1/00; G02B1/04; G02B1/045; G02B1/048; B; B29; B29C; B29C48/00; B29C48/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
In an optical fiber comprising a cladding and a core, the improvement wherein said cladding comprises a copolymer consisting essentially of (a) fluoroalkylmethacrylate, said fluoroalkymethacrylate giving, when singly polymerized, a homopolymer having the properties of a glass transition temperature and a refractive index satisfying the following formulae (I) and (II), respectively. 1/T.sub.g ≦9.47×10.sup.-3 -4.556×10.sup.-3 ×n.sup.20 (I) n.sup.20 ≦1.42 (II) wherein T g represents the class transition temperature and n 20 represents the refractive index of said hompolymer, (b) 0.5 to 10% by weight of acrylic acid based on the weight of said fluoroalkylmethacrylate, and (c) 0 to 30% by weight of a methacrylic acid ester based on the weight of said fluoroalkylmethacrylate.
Claim 2
Dependent Claim
112 words
In an optical fiber comprising a cladding and a core, the improvement wherein said cladding comprises a copolymer consisting essentially of (a) fluoroalkylmethacrylate, said fluoroalkymethacrylate giving, when singly polymerized, a homopolymer having the properties of a glass transition temperature and a refractive index satisfying the following formulae (I) and (II), respectively. 1/T.sub.g ≦9.47×10.sup.-3 -4.556×10.sup.-3 ×n.sup.20 (I) n.sup.20 ≦1.42 (II) wherein T g represents the class transition temperature and n 20 represents the refractive index of said hompolymer, (b) 0.5 to 10% by weight of acrylic acid based on the weight of said fluoroalkylmethacrylate, and (c) 0 to 30% by weight of a methacrylic acid ester based on the weight of said fluoroalkylmethacrylate.
Claim 3
Dependent Claim
30 words
An optical fiber according to claim 1 wherein said fluoroalkylmethacrylate is selected from the group consisting of trifluoroethylmethacrylate, 2,2,3,3-tetrafluoropropylmethacrylate, 2,2,3,3,3-pentafluoropropylmethacrylate, 2-trifluoromethyl-3,3,3-trifluoropropylmethacrylate, 2-trifluoromethyl-2,3,3,3-tetrafluoropropylmethacrylate, 2,2,3,4,4,4-hexafluorobutylmethacrylate, 1-methyl-2,2,3,4,4-hexafluorobutylmethacrylate, 1,1,2,2-tetrachydro-9-trifluoromethylperfluorodecylmethacrylate, 1,1-dihydroperfluorobutylmethacrylate, 1,1-dimethyl-2,2,3,3-tetrafluoropropylmethacrylate, 1,1-dimethyl-2,2,3,3,4,4,5,5-octafluoropentylmethacrylate and 1,1-dimethyl-2,2,3,4,4,4-hexafluorobutylmethacrylate.
Claim 4
Dependent Claim
14 words
An optical fiber according to claim 1 wherein said methacrylic acid ester comprises methylmethacrylate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |