US4787709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber having glass core and fluoro-copolymer cladding
Assignee: Central Glass Co Ltd
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Filing: 1986-02-06
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Granted: 1988-11-29
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Expires: 2006-02-06
Abstract
Abstract The invention relates to an optical fiber of the step-index type using quartz glass or an inorganic optical glass as the core material and a fluorine-containing resin as the cladding material. A copolymer of vinylidene fluoride with hexafluoroacetone, preferably at a molar ratio in the range from 96:4 to 88:12, is employed as the cladding material. Using such a copolymer, a highly transparent and very strong and tough cladding layer can easily be formed by a solution coating method.
Inventors
- 👤 Akira Kawada
- 👤 Takashi Yasumura
- 👤 Toshio Koishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:53
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/105; C03C13/00; C03C13/04; G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
An optical fiber of the step-index type comprising: a solid cylindrical core which is formed of an inorganic glass; and a cladding layer which is in close contact with said core and is formed of a copolymer of vinylidene fluoride with hexafluoroacetone wherein the molar ratio of vinylidene fluoride to hexafluoroacetone in said copolymer is in the range from 96:4 to 88:12.
Claim 2
Dependent Claim
62 words
An optical fiber of the step-index type comprising: a solid cylindrical core which is formed of an inorganic glass; and a cladding layer which is in close contact with said core and is formed of a copolymer of vinylidene fluoride with hexafluoroacetone wherein the molar ratio of vinylidene fluoride to hexafluoroacetone in said copolymer is in the range from 96:4 to 88:12.
Claim 3
Dependent Claim
14 words
An optical fiber according to claim 1, wherein said inorganic glass is quartz glass.
Claim 4
Dependent Claim
15 words
An optical fiber according to claim 1, wherein said inorganic glass is an optical glass.
Claim 5
Dependent Claim
28 words
An optical fiber according to claim 1, wherein said cladding layer is formed by a solution coating method using a solution of said copolymer in an organic solvent.
Claim 6
Dependent Claim
31 words
An optical fiber according to claim 4, wherein the intrinsic viscosity of a solution of said copolymer in N,N-dimethylacetamide at 30° C. is in the range from 0.5 to 2.0 dl/g.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |