Patent US4458986A successfully refreshed from Google Patents.
US4458986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated plastic optical fiber
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1981-10-21
•
Granted: 1984-07-10
•
Expires: 2001-10-21
Abstract
Abstract A plastic fiber or an assembly thereof provided with first and second layers. The plastic fiber includes a core portion and a clad portion having lower refractive index than that of the core portion. The fiber is provided with the first coating formed over said clad portion. The first coating is formed of a saponification product of ethylene-vinyl acetate (EVA) copolymer, and the second coating is formed over said first coating and is made of a thermoplastic resin.
Inventors
- 👤 Masao Yuto
- 👤 Yuji Kameo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/443; G02B6/4432; G02B6/02; G02B6/02033; G02B6/4402; G02B6/4415
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A coated single optical plastic fiber or assembly thereof having a core portion and a clad portion formed of plastic substance, said core portion having a higher refractive index than that of said clad portion, characterized in that the surface of said plastic fiber is directly coated with a coating of a saponification product of etylene-vinyl acetate copolymer, and a thermoplastic resin is coated over said coating as an outermost layer.
Claim 2
Dependent Claim
71 words
A coated single optical plastic fiber or assembly thereof having a core portion and a clad portion formed of plastic substance, said core portion having a higher refractive index than that of said clad portion, characterized in that the surface of said plastic fiber is directly coated with a coating of a saponification product of etylene-vinyl acetate copolymer, and a thermoplastic resin is coated over said coating as an outermost layer.
Claim 3
Dependent Claim
33 words
A plastic fiber or assembly thereof according to claim 1, wherein said saponification product of ethylene-vinyl acetate (EVA) copolymer is induced EVA having a vinyl acetate (VA) content of 50 wt% or more.
Claim 4
Dependent Claim
30 words
A plastic fiber or assembly thereof according to claim 2, further comprising an intermediate layer provided between the coating of said saponification product of EVA and said thermoplastic outermost layer.
Claim 5
Dependent Claim
32 words
A plastic fiber or assembly thereof according to claim 2, wherein said thermoplastic outermost layer is a flame-retardant resin selected from the group consisting of flame-resistant polyethylene, polyvinylchloride (PVC) and flame-resistant polyurethane.
Claim 6
Dependent Claim
22 words
A plastic fiber or assembly thereof according to claim 2, wherein two of said plastic fibers are assembled to provide two-core fibers.
Claim 7
Dependent Claim
30 words
A plastic fiber or assembly thereof according to claim 2, wherein a plurality of said plastic fibers are assembled and a tension member is centrally disposed within said fiber assembly.
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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |