US4725453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of production of a reinforced optical fiber
Assignee: Ube Exsymo Co Ltd
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Filing: 1985-12-17
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Granted: 1988-02-16
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Expires: 2005-12-17
Abstract
Abstract A reinforced optical fiber includes a reinforcing inner layer interposed between a buffer layer of silicon rubber and a FRP layer made of styrene resin and fibers. The reinforcing inner layer is formed by binding filaments attached longitudinally onto the buffer layer with a non-styrene resin. The additional reinforcing inner layer improves crushing resistance and also keeps low an increase of transmission loss. The reinforcing inner layer directly covering the buffer layer is formed by the steps of longitudinally attaching dry filaments to the buffer layer and then impregnating the filaments with a curable resin.
Inventors
- 👤 Takayoshi Nakasone
- 👤 Yoji Ida
- 👤 Kenji Kozuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:32
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/443; G02B6/4431; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/28; B29C70/40; B29C70/50; B29C70/52; B29C70/521; G02B6/4402; B29L; B29L2011/00; B29L2011/0075
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A method for producing a single-core cord of reinforced optical fiber comprising the steps of: providing an optical fiber element by covering an optical fiber with a primary coating of silicone rubber; arranging reinforcing fibers longitudinally around said optical fiber element; impregnating said reinforcing fibers with a curable resin material containing non-styrene monomer; passing the resultant product through a squeezing die to form a non-cured inner layer; covering said inner layer with a layer composed of reinforcing fibers and a curable resin material containing styrene monomer; passing the resultant product through a squeezing die to form a non-cured outer layer; covering said outer layer with a molten thermoplastic resin to a predetermined diameter; cooling and solidifying said thermoplastic resin to form a surface layer; and heating the resultant product to harden said curable resin material in said inner layer and said outer layer, thereby forming a secondary coating having a three-layer structure.
Claim 2
Independent Claim
152 words
A method for producing a single-core cord of reinforced optical fiber comprising the steps of: providing an optical fiber element by covering an optical fiber with a primary coating of silicone rubber; arranging reinforcing fibers longitudinally around said optical fiber element; impregnating said reinforcing fibers with a curable resin material containing non-styrene monomer; passing the resultant product through a squeezing die to form a non-cured inner layer; covering said inner layer with a layer composed of reinforcing fibers and a curable resin material containing styrene monomer; passing the resultant product through a squeezing die to form a non-cured outer layer; covering said outer layer with a molten thermoplastic resin to a predetermined diameter; cooling and solidifying said thermoplastic resin to form a surface layer; and heating the resultant product to harden said curable resin material in said inner layer and said outer layer, thereby forming a secondary coating having a three-layer structure.
Claim 3
Dependent Claim
34 words
A method as claimed in claim 1, wherein the heating step for hardening said curable resin material comprises applying under pressure heat with a temperature close to a melting point of said thermoplastic resin.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |