US4464013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filled optical fiber cables
Assignee: Furukawa Electric North America Inc
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Filing: 1982-03-29
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Granted: 1984-08-07
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Expires: 2002-03-29
Abstract
Abstract A filling composition comprising a styrene-rubber-styrene block copolymer and an oil is used to prevent water entry into optical fiber cable. The composition provides: (1) suitably low viscosity to allow filling the cable at elevated temperatures; (2) low modulus to minimize microbending loss in the optical fibers; and (3) high slump temperature to minimize flow of the material at an elevated service temperature from the end of a filled cable.
Inventors
- 👤 Raffaele A. Sabia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:04
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/44384
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A cable comprising one or more optical fibers contained within a sheath leaving voids between the fibers and the sheath, and a filling material at least partially filling the voids, characterized in that the filling material comprises a mixture of (1) 85 to 94 weight percent ASTM Type 103, 104A, or 104B, or mixtures thereof, paraffinic or napthenic oil having a minimum specific gravity of 0.855; a minimum SUS viscosity at 210 degrees F. of 40; and a maximum pour point ASTMD 97 of -5 degrees F.; and a maximum of 5 percent aromatic oils; (2) from 6 to 15 weight percent of a styrene-ethylene-butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5; with the foregoing ingredients (1) and (2) comprising at least 99 weight percent of said filling material, and further comprising up to 1 weight percent thermal oxidative stabilizer.
Claim 2
Dependent Claim
144 words
A cable comprising one or more optical fibers contained within a sheath leaving voids between the fibers and the sheath, and a filling material at least partially filling the voids, characterized in that the filling material comprises a mixture of (1) 85 to 94 weight percent ASTM Type 103, 104A, or 104B, or mixtures thereof, paraffinic or napthenic oil having a minimum specific gravity of 0.855; a minimum SUS viscosity at 210 degrees F. of 40; and a maximum pour point ASTMD 97 of -5 degrees F.; and a maximum of 5 percent aromatic oils; (2) from 6 to 15 weight percent of a styrene-ethylene-butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5; with the foregoing ingredients (1) and (2) comprising at least 99 weight percent of said filling material, and further comprising up to 1 weight percent thermal oxidative stabilizer.
Claim 3
Dependent Claim
27 words
The cable of claim 1 wherein said filling material comprises approximately 93 weight percent oil, approximately 7 percent copolymer, and approximately 0.2 percent oxidative stabilizer by weight.
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) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |