Patent US4720428A successfully refreshed from Google Patents.
US4720428A
Expired / Lapsed
US
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Cladding materials for optical fibers
Assignee: Daikin Industries Ltd
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Filing: 1985-05-20
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Granted: 1988-01-19
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Expires: 2005-05-20
Abstract
Abstract This invention provides a cladding material for an optical fiber, said cladding material having a structural unit represented by the formula <IMAGE> (a) wherein R1 represents chain hydrocarbon group having 1 to 5 carbon atoms or cyclic hydrocarbon group having 3 to 6 carbon atoms and optionally substituted with lower alkyl group having 1 to 6 carbon atoms.
Inventors
- 👤 Akira Ohmori
- 👤 Nobuyuki Tomihashi
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:53
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/105; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
In an optical fiber comprising a cladding and a polymeric core having high transparency, the improvement wherein said cladding comprises a polymer having a structural unit represented by the formula ##STR11## wherein R 1 represents chain hydrocarbon group having 1 to 5 carbon atoms or cyclic hydrocarbon group having 3 to 6 carbon atoms and optionally substituted with lower alkyl group having 1 to 6 carbon atoms.
Claim 2
Dependent Claim
67 words
In an optical fiber comprising a cladding and a polymeric core having high transparency, the improvement wherein said cladding comprises a polymer having a structural unit represented by the formula ##STR11## wherein R 1 represents chain hydrocarbon group having 1 to 5 carbon atoms or cyclic hydrocarbon group having 3 to 6 carbon atoms and optionally substituted with lower alkyl group having 1 to 6 carbon atoms.
Claim 3
Dependent Claim
151 words
In an optical fiber comprising a cladding and a polymeric core having high transparency, the improvement wherein said cladding comprises a polymer comprising (i) at least 5 mole % of a structural unit represented by the formula ##STR12## wherein R 1 represents chain hydrocarbon group having 1 to 5 carbon atoms or cyclic hydrocarbon group having 3 to 6 carbon atoms and optionally substituted with lower alkyl group having 1 to 6 carbon atoms and (ii) up to 95 mole % of a structural unit represented by the formula ##STR13## wherein R 2 represent hydrogen atom or chain hydrocarbon group having 1 to 5 carbon atoms, and R 3 represents hydrogen atoms, chain hydrocarbon group having 1 to 5 carbon atoms and optionally containing fluorine or cyclic hydrocarbon group having 3 to 6 carbon atoms, optionally containing fluorine and optionally substituted with lower alkyl group having 1 to 6 carbon atoms.
Claim 4
Dependent Claim
151 words
In an optical fiber comprising a cladding and a polymeric core having high transparency, the improvement wherein said cladding comprises a polymer comprising (i) at least 5 mole % of a structural unit represented by the formula ##STR12## wherein R 1 represents chain hydrocarbon group having 1 to 5 carbon atoms or cyclic hydrocarbon group having 3 to 6 carbon atoms and optionally substituted with lower alkyl group having 1 to 6 carbon atoms and (ii) up to 95 mole % of a structural unit represented by the formula ##STR13## wherein R 2 represent hydrogen atom or chain hydrocarbon group having 1 to 5 carbon atoms, and R 3 represents hydrogen atoms, chain hydrocarbon group having 1 to 5 carbon atoms and optionally containing fluorine or cyclic hydrocarbon group having 3 to 6 carbon atoms, optionally containing fluorine and optionally substituted with lower alkyl group having 1 to 6 carbon atoms.
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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) | 1991-01-18 | 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 |