US4505543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic optical fibers
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1982-10-14
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Granted: 1985-03-19
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Expires: 2002-10-14
Abstract
Abstract A plastic optical fiber comprising a core of a copolymer of an alkyl methacrylate and a styrene derivative and a cladding of a copolymer of vinylidene fluoride and a perfluoroolefin provided on the core, the copolymer of the cladding having a melting point of at least 120 DEG C. and a perfluoroolefin content in the range of from 3 mol % to 70 mol %.
Inventors
- 👤 Yoshinobu Ueba
- 👤 Shinichi Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/045; G02B6/00; G02B6/02; G02B6/02033; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A plastic optical fiber comprising a core of a copolymer of an alkyl methacrylate and a styrene derivative, wherein said styrene derivative is selected from the group consisting of p-phenylstyrene, p-tert-butylstyrene, p-cyanostyrene, p-iodostyrene, a,b,b-trifluorostyrene, perfluorostyrene and 2,3,4,5,6-pentafluorostyrene, and a cladding of a copolymer of vinylidene fluoride and a perfluoroolefin provided on said core, the polymer of said cladding having a melting point of at least 120° C. and perfluoroolefin content in the range of from 3 mol% to 70 mol%.
Claim 2
Dependent Claim
80 words
A plastic optical fiber comprising a core of a copolymer of an alkyl methacrylate and a styrene derivative, wherein said styrene derivative is selected from the group consisting of p-phenylstyrene, p-tert-butylstyrene, p-cyanostyrene, p-iodostyrene, a,b,b-trifluorostyrene, perfluorostyrene and 2,3,4,5,6-pentafluorostyrene, and a cladding of a copolymer of vinylidene fluoride and a perfluoroolefin provided on said core, the polymer of said cladding having a melting point of at least 120° C. and perfluoroolefin content in the range of from 3 mol% to 70 mol%.
Claim 3
Dependent Claim
31 words
A plastic optical fiber according to claim 1, wherein said alkyl methacrylate is represented by the formula ##STR7## wherein R 1 represents an alkyl group having 1 to 10 carbon atoms.
Claim 4
Dependent Claim
22 words
A plastic optical fiber according to claim 2, wherein said alkyl group is a methyl, ethyl, propyl, butyl, isobornyl or adamantanyl group,
Claim 5
Dependent Claim
15 words
A plastic optical fiber according to claim 2, wherein said alkyl methacrylate is methyl methacrylate.
Claim 6
Dependent Claim
32 words
A plastic optical fiber according to claim 1, wherein said copolymer of alkyl mthacrylate and styrene derivative is produced at a monomer feed ratio of 3 to 80 mol% of styrene derivative.
Claim 7
Dependent Claim
18 words
A plastic optical fiber according to claim 1, wherein said perfluoroolefin is tetrafluoroethylene, vinyl fluoride, hexafluoropropylene or octafluoroisobutylene.
Claim 8
Dependent Claim
13 words
A plastic optical fiber according to claim 6 wherein the perfluoroolefin is tetrafluoroethylene.
Claim 9
Dependent Claim
26 words
A plastic optical fiber according to claim 7, wherein the tetrafluoroethylene content in the copolymer of vinylidene fluoride and tetrafluoroethylene is from 3 to 60 mol%.
Claim 10
Dependent Claim
20 words
A plastic optical fiber according to claim 5, wherein said monomer feed ratio is 5 to 60% of styrene derivative.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |