US4576438A
Expired / Lapsed
US
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Heat-resisting optical fiber
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1983-06-16
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Granted: 1986-03-18
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Expires: 2003-06-16
Abstract
Abstract A heat-resisting optical fiber comprising a core and a cladding, characterized in that the core is made of a polymer comprising units of a methacrylic ester, of which the ester moiety has an alicyclic hydrocarbon group of not less than 8 carbon atoms, and the cladding is made of a transparent polymeric material having a refractive index of at least 3% smaller than that of the core. This optical fiber has excellent heat resistance and good flexibility and can be used at a high temperature over 110 DEG C.
Inventors
- 👤 Yoshiharu Tatsukami
- 👤 Yasuyuki Kato
- 👤 Shigeo Wake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:32
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033; D; D01; D01F; D01F8/00; D01F8/04; D01F8/10; G02B1/00; G02B1/04; G02B1/045; G02B1/046; G02B1/048; G02B6/44; G02B6/4401; G02B6/4429; G02B6/4436; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A heat-resisting optical fiber comprising a core and a cladding, characterized in that the core is made of a polymer comprising 3 to 100% by weight of units of the methacrylic ester and 97 to 0% by weight of units of at least one member selected from the group consisting of C 1 -C 6 alkyl acrylate and C 1 -C 6 alkyl methacrylate, of which the ester moiety has an alicyclic hydrocarbon group of not less than 8 carbon atoms, and the cladding is made of a transparent polymeric material having a refractive index of at least 3% smaller than that of the core.
Claim 2
Dependent Claim
105 words
A heat-resisting optical fiber comprising a core and a cladding, characterized in that the core is made of a polymer comprising 3 to 100% by weight of units of the methacrylic ester and 97 to 0% by weight of units of at least one member selected from the group consisting of C 1 -C 6 alkyl acrylate and C 1 -C 6 alkyl methacrylate, of which the ester moiety has an alicyclic hydrocarbon group of not less than 8 carbon atoms, and the cladding is made of a transparent polymeric material having a refractive index of at least 3% smaller than that of the core.
Claim 3
Dependent Claim
36 words
The optical fiber according to claim 2, wherein the polymer for the core comprises 3 to 30% by weight of units of the methacrylic ester and 97 to 70% by weight of units of methyl methacrylate.
Claim 4
Dependent Claim
45 words
The optical fiber according to claim 1, wherein the methacrylic ester has the formula: ##STR2## wherein A is an alicyclic hydrocarbon group having at least 8 carbons atoms and R is a single bond or a divalent hydrocarbon group having 1 or 2 carbon atoms.
Claim 5
Dependent Claim
31 words
The optical fiber according claim 3, wherein methacrylic ester is the one selected from the group consisting of fenchyl methacrylate, 1-menthyl methacrylate, bornyl methacrylate, isobornyl methacrylate, adamantyl methacrylate and dimethyladamantyl methacrylate.
Claim 6
Dependent Claim
17 words
The optical fiber according to claim 1, wherein the polymeric material for the cladding is a resin.
Claim 7
Dependent Claim
31 words
The optical fiber according to claim 5, wherein the resin is selected from the group consisting of vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-trifluoroethylene copolymer, vinylidene floride-tetrafluoroethylene-hexafluoropropene terpolymer, poly(perfluoro-tert-butyl) methacrylate and thermoplastic fluororubber.
Claim 8
Dependent Claim
17 words
The optical fiber according to claim 1, wherein the polymeric material for the cladding is a fluororubber.
Claim 9
Dependent Claim
21 words
The optical fiber according to claim 7, wherein the fluororubber is vinylidene fluoride-hexafluoropropene copolymer, vinylidene fluoride-pentafluoropropene copolymer and vinylidene fluoride-chlorotrifluoroethylene copolymer.
Claim 10
Dependent Claim
14 words
The optical fiber according to claim 7, wherein the fluororubber comprises a crosslinking agent.
Claim 11
Dependent Claim
84 words
A heat-resisting optical fiber comprising a core and a cladding, characterized in that the core is made of a polymer comprising 3 to 30% by weight of units of the methacrylic ester and 97 to 70% by weight of units of methyl methacrylate, of which the ester moiety has an alicyclic hydrocarbon group of not less than 8 carbon atoms, and the cladding is made of a transparent polymeric material having a refractive index of at least 3% smaller than that of the core.
Claim 12
Dependent Claim
84 words
A heat-resisting optical fiber comprising a core and a cladding, characterized in that the core is made of a polymer comprising 3 to 30% by weight of units of the methacrylic ester and 97 to 70% by weight of units of methyl methacrylate, of which the ester moiety has an alicyclic hydrocarbon group of not less than 8 carbon atoms, and the cladding is made of a transparent polymeric material having a refractive index of at least 3% smaller than that of the core.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |