US4966435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic optical fiber
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-11-29
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Granted: 1990-10-30
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Expires: 2009-11-29
Abstract
Abstract A plastic core-plastic cladding optical fiber is described wherein the core is composed of a copolymer of a perfluorodioxole represented by the following formula: ##STR1## wherein R and R' independently represent F or CF 3 , with at least one other ethylenically unsaturated monomer substantially free of CH bonds and the copolymer has no first order transition temperature as determined by the differential scanning colorimetry (DSC) and has a second order transition temperature not lower than 100° C. as determined by DSC.
Inventors
- 👤 Tsuruyoshi Matsumoto
- 👤 Takashi Yamamoto
- 👤 Teruhiko Sugimori
- 👤 Katsuhiko Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:03
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033; G02B1/00; G02B1/04; G02B1/045; G02B1/046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A plastic optical fiber having a core-sheath structure, wherein the core component is composed of a copolymer of a perfluorodioxole represented by the following formula: ##STR3## wherein R and R' independently represent F or CF 3 , with at least one other ethylenically unsaturated monomer substantially free of CH bonds, and said copolymer has no first order transition temperature as determined by the differential scanning colorimetry (DSC}and has a second order transition temperature not lower than 100° C. as determined by DSC.
Claim 2
Dependent Claim
82 words
A plastic optical fiber having a core-sheath structure, wherein the core component is composed of a copolymer of a perfluorodioxole represented by the following formula: ##STR3## wherein R and R' independently represent F or CF 3 , with at least one other ethylenically unsaturated monomer substantially free of CH bonds, and said copolymer has no first order transition temperature as determined by the differential scanning colorimetry (DSC}and has a second order transition temperature not lower than 100° C. as determined by DSC.
Claim 3
Dependent Claim
33 words
A plastic optical fiber as set forth in claim 1, wherein the unstable end group content, as determined by the Fourier transform infrared spectroscopy (FTIR), in the perfluorodioxole copolymer is below 5 meq/kg.
Claim 4
Dependent Claim
29 words
A plastic optical fiber as set forth in claim 1, wherein the other ethylenically unsaturated monomer is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and perfluoro(methyl vinyl ether).
References Cited (Backward Citations)
US4431786A
Cited
US4535175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |