US4720166A
Expired / Lapsed
US
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Cladding materials for optical fibers
Assignee: Daikin Industries Ltd
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Filing: 1986-07-30
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Granted: 1988-01-19
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Expires: 2006-07-30
Abstract
Abstract This invention provides a cladding material in an optical fiber which comprises a polymer comprising: (1) a structural unit represented by the formula <IMAGE> (a) and (2) at least one of structural unit (i) <IMAGE> (b) and (ii) <IMAGE> (c)
Inventors
- 👤 Akira Ohmori
- 👤 Nobuyuki Tomihashi
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:22
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/105; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/22; C08F220/00; C08F220/02; C08F220/10; C08F220/22; C08F220/24; G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
In an optical fiber comprising a cladding and a core, an improvement wherein the cladding comprises a polymer comprising: (1) 10 to 100 mole % of a structural unit represented by the formula ##STR27## wherein Rf is a chlorofluorobutyl group, fluoro-lower alkyl group, fluorometnylbenzyl group, fluoromethylcyclohexyl group, ##STR28## (wherein R 1 is a fluoroheptyl group) or ##STR29## (wherein R 2 is fluoropropyl group), and (2) up to 90 mole % of at least one structural unit selected from the group consisting of; (i) ##STR30## wherein R 3 is hydrogen, fluorine or methyl group and R 4 is methyl group, phenyl group, cyclohexyl group, trimethylcyclohexyl group or ##STR31## (wherein R 1 is as defined above) and (ii) ##STR32## wherein R 5 is hydrogen or methyl group and Rf is as defined above.
Claim 2
Dependent Claim
131 words
In an optical fiber comprising a cladding and a core, an improvement wherein the cladding comprises a polymer comprising: (1) 10 to 100 mole % of a structural unit represented by the formula ##STR27## wherein Rf is a chlorofluorobutyl group, fluoro-lower alkyl group, fluorometnylbenzyl group, fluoromethylcyclohexyl group, ##STR28## (wherein R 1 is a fluoroheptyl group) or ##STR29## (wherein R 2 is fluoropropyl group), and (2) up to 90 mole % of at least one structural unit selected from the group consisting of; (i) ##STR30## wherein R 3 is hydrogen, fluorine or methyl group and R 4 is methyl group, phenyl group, cyclohexyl group, trimethylcyclohexyl group or ##STR31## (wherein R 1 is as defined above) and (ii) ##STR32## wherein R 5 is hydrogen or methyl group and Rf is as defined above.
Claim 3
Dependent Claim
50 words
In an optical fiber comprising a cladding and a core according to claim 1 wherein the polymer forming the the cladding has a molecular weight of about 200,000 to 5,000,000, a refractive index of about 1.36 to about 1.44 and a softening point of about 80° to about 140° C.
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) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |