Patent US4826284A successfully refreshed from Google Patents.
US4826284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin-made heat-resistant optical fiber
Assignee: Kureha Corp
•
Filing: 1987-03-06
•
Granted: 1989-05-02
•
Expires: 2007-03-06
Abstract
Abstract A resin-made heat-resistant optical fiber is formed of a core of a hardened thermosetting resin and a cladding of a polymer or copolymer having a refractive index smaller by at least 1%, preferably, at least 3% than that of the core. The thermosetting resin is selected from the group consisting of epoxy resins, phenol resins and urethane resins. The polymer or copolymer may preferably be a thermoplastic organic resin.
Inventors
- 👤 Teruo Sakagami
- 👤 Yasufumi Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:25
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/045; D; D01; D01F; D01F8/00; D01F8/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A resin-made heat-resistant optical fiber comprising a core of a hardened thermosetting resin flowed and hardened inside a preformed cladding of a polymer or copolymer having a refractive index smaller by at least 1% than that of the core, said thermosetting resin being selected from the group consisting of flowable epoxy resins, phenol resins and urethane resins.
Claim 2
Dependent Claim
57 words
A resin-made heat-resistant optical fiber comprising a core of a hardened thermosetting resin flowed and hardened inside a preformed cladding of a polymer or copolymer having a refractive index smaller by at least 1% than that of the core, said thermosetting resin being selected from the group consisting of flowable epoxy resins, phenol resins and urethane resins.
Claim 3
Dependent Claim
23 words
The resin-made heat-resistant optical fiber as claimed in claim 1, wherein the polymer or copolymer forming the cladding is a thermoplastic organic resin.
Claim 4
Dependent Claim
33 words
The resin-made heat-resistant optical fiber as claimed in claim 1, wherein the refractive index of the polymer or copolymer forming the cladding is smaller by at least 3% than that of the core.
Claim 5
Dependent Claim
130 words
The resin-made heat-resistant optical fiber as claimed in claim 1, wherein the optical fiber has been fabricated by filling a clad preform in the form of a hollow fiber, which is made of a polymer or copolymer and serves to form a cladding, with a flowable core material composed of at least one of thermosetting resins, polymerizable monomers capable of yielding thermosetting resins and mixtures thereof, and then subjecting the resultant composite material to a treatment inclusive of a heating step so as to convert the core material into a hardened thermosetting resin, thereby to form a core having a refractive index at least 1% greater than that of the cladding; and the hardened thermosetting resin is selected from the group consisting of epoxy resins, phenol resins and urethane resins.
References Cited (Backward Citations)
US4186409A
Cited
US4681400A
Cited
US4575188A
Cited
US4576438A
Cited
US4552431A
Cited
US4687295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |