US4231635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication cable with glass fiber light waveguides
Assignee: Siemens AG
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Filing: 1978-05-12
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Granted: 1980-11-04
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Expires: 1998-05-12
Abstract
Abstract A communication cable having at least one light waveguide of a glass fiber provided with a close fitting casing characterized by the casing being prestressed in tension to exert a uniform constant longitudinal compression upon the glass fiber. The casing material, which may be a thermoplastic material selected from a group consisting of polyester, fluoropolymers, polyamides and polymethacrylates, can also be impregnated with filaments which are also placed in tension to apply a compressive force on the glass fiber.
Inventors
- 👤 Guenter Zeidler
- 👤 Ulrich Oestreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:52
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/443
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
In a communication cable having at least one light waveguide of a glass fiber provided with a close fitting casing, the improvement comprising the casing being of a material with a modulus of elasticity greater then 1500 N/mm 2 , said casing having a layer thickness of at least 100 μm and a maximum thickness of 1.5 mm, said casing being prestressed in tension to exert a uniform constant longitudinal compression upon the glass fiber.
Claim 2
Dependent Claim
75 words
In a communication cable having at least one light waveguide of a glass fiber provided with a close fitting casing, the improvement comprising the casing being of a material with a modulus of elasticity greater then 1500 N/mm 2 , said casing having a layer thickness of at least 100 μm and a maximum thickness of 1.5 mm, said casing being prestressed in tension to exert a uniform constant longitudinal compression upon the glass fiber.
Claim 3
Dependent Claim
32 words
In a communication cable according to claim 1, which includes an intermediate layer having a thickness of less than 10 μm disposed between the surface of the glass fiber and the casing.
Claim 4
Dependent Claim
36 words
In a communication cable according to claim 1, in which the material of the casing is impregnated with filaments selected from a group consisting of glass, aromatic polyamides and steel filaments, said filaments being under tension.
Claim 5
Dependent Claim
30 words
In a communication cable according to claim 1, wherein the material of the casing on a surface is provided with protective filaments under tension and covered by a protective coating.
Claim 6
Dependent Claim
37 words
In a communication cable according to claim 1, which includes a plurality of glass fibers with each fiber being provided with a casing, said plurality of glass fibers being stranded together to form a flat cable arrangement.
Claim 7
Dependent Claim
27 words
In a communication cable according to claim 1, wherein the cable includes an additional casing selected from a group consisting of polyethylene, polyvinyl chloride, polyamide and polyurethane.
Claim 8
Dependent Claim
47 words
In a communication cable according to claim 1, wherein each of the light conducting fibers has a core diameter d and a numerical aperture A N , said numerical aperture and core diameter being governed by the equation d 3 /A N 6 <40 mm 3 .
Claim 9
Dependent Claim
27 words
In a communication cable according to claim 1, wherein the casing material is a thermoplastic material selected from a group consisting of polyester, fluoropolymers, polyamides and polymethacrylates.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |