US4147407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coatings for fiber waveguides
Assignee: AT&T Inc
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Filing: 1978-01-09
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Granted: 1979-04-03
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Expires: 1998-01-09
Abstract
Abstract Microbending loss is reduced and abrasion protection is afforded for optical fibers by relatively thick polymer coatings characterized in part by a preferred elastic tensile modulus and cold flow property. The coating process uses rapid cooling of a liquid application to promote rapid gelation or solidification and thus achieve uniform coating diameter without beading. Fibers so coated are formed into ribbon structures having definite center-to-center fiber spacing. Preparation of coated fibers or ribbon structures for splicing is achieved by solvent stripping of the coating.
Inventors
- 👤 Bernard R. Eichenbaum
- 👤 William B. Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/028; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4403; G02B6/4439; G02B6/4457; C03B2203/00; C03B2203/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
An optical fiber waveguide comprising an optical fiber and a protective coating covering the fiber comprising an ethylene vinyl acetate copolymer in which the vinyl acetate content is in the range of 10% to 25% of the copolymer, the elastic modulus of the polymer coating is in the range of 2-5 kg/mm 2 and the melt index of the copolymer is in the range of 200-500.
Claim 2
Dependent Claim
66 words
An optical fiber waveguide comprising an optical fiber and a protective coating covering the fiber comprising an ethylene vinyl acetate copolymer in which the vinyl acetate content is in the range of 10% to 25% of the copolymer, the elastic modulus of the polymer coating is in the range of 2-5 kg/mm 2 and the melt index of the copolymer is in the range of 200-500.
Claim 3
Dependent Claim
17 words
The fiber waveguide of claim 1 in which the melt index is of the order of 3.
Claim 4
Dependent Claim
28 words
The fiber waveguide of claim 2 in which the vinyl acetate content of the copolymer is approximately 18% and the elastic modulus is approximately 4.5 kg/mm 2 .
References Cited (Backward Citations)
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US3711262A
Cited
US3865466A
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FR2233637A1
Cited
US3871935A
Cited
US3980390A
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US3917383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |