Patent US4615584A successfully refreshed from Google Patents.
US4615584A
Expired / Lapsed
US
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Optical material
Assignee: Daikin Industries Ltd
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Filing: 1985-11-20
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Granted: 1986-10-07
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Expires: 2005-11-20
Abstract
Abstract This invention relates to an optical material comprising a polymer which has a structural unit represented by the formula <IMAGE> (a) wherein X1 and X2 are the same or different and are each hydrogen or deuterium, and R1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group (with or without a substituted lower alkyl group) having 3 to 6 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms in an amount of at least 5 mole % of the polymer.
Inventors
- 👤 Akira Ohmori
- 👤 Nobuyuki Tomihashi
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:07
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/22; G; G02; G02B; G02B1/00; G02B1/04; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
In an optical fiber comprising a cladding and a core, the improvement wherein said core consists essentially of a homopolymer which has a structural unit represented by the formula ##STR36## wherein X 1 and X 2 are the same or different and each represent hydrogen or deuterium, and R 1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms, said polymer having a refractive index of 1.45 to 1.60 and a softening temperature of 100° to 200° C.
Claim 2
Dependent Claim
109 words
In an optical fiber comprising a cladding and a core, the improvement wherein said core consists essentially of a homopolymer which has a structural unit represented by the formula ##STR36## wherein X 1 and X 2 are the same or different and each represent hydrogen or deuterium, and R 1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms, said polymer having a refractive index of 1.45 to 1.60 and a softening temperature of 100° to 200° C.
Claim 3
Dependent Claim
221 words
In an optical fiber comprising a cladding and a core, the improvement wherein said core consists essentially of a polymer which has at least 5% by weight of a structural unit represented by the formula ##STR37## wherein X 1 and X 2 are the same or different and each represent hydrogen or deuterium, and R 1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms, and not more than 95% by weight of a structural unit represented by the formula ##STR38## wherein R 2 is hydrogen, deuterium, a chain hydrocarbon group having 1 to 5 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms and R 3 is hydrogen, deuterium, a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group, deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms, or a deuterium-substituted cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group, said copolymer having a refractive index of 1.45 to 1.60 and a softening temperature of 100° to 200° C.
Claim 4
Dependent Claim
221 words
In an optical fiber comprising a cladding and a core, the improvement wherein said core consists essentially of a polymer which has at least 5% by weight of a structural unit represented by the formula ##STR37## wherein X 1 and X 2 are the same or different and each represent hydrogen or deuterium, and R 1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms, and not more than 95% by weight of a structural unit represented by the formula ##STR38## wherein R 2 is hydrogen, deuterium, a chain hydrocarbon group having 1 to 5 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms and R 3 is hydrogen, deuterium, a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group, deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms, or a deuterium-substituted cyclic hydrocarbon group having 3 to 6 carbon atoms with or without a lower alkyl group, said copolymer having a refractive index of 1.45 to 1.60 and a softening temperature of 100° to 200° 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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |