Patent US4711523A successfully refreshed from Google Patents.
US4711523A
Expired / Lapsed
US
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Waterproof optical fiber cable
Assignee: Dainichi Nippon Cables Ltd
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Filing: 1987-04-15
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Granted: 1987-12-08
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Expires: 2007-04-15
Abstract
Abstract An optical fiber cable comprising a water blocking layer, an optical fiber disposed inside the water blocking layer and a water blocking material filling the space between the water blocking layer and the optical fiber, the water blocking material comprising a grease having a worked penetration of 85 to 475 as measured according to ASTM-D-712 at room temperature.
Inventors
- 👤 Eiji Iri
- 👤 Takashi Kaneko
- 👤 Takeshi Shintani
- 👤 Kotaro Mio
- 👤 Yasuo Ijiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:04
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/02; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/44384; H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H01B7/288
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
An optical fiber cable comprising a water blocking layer, an optical fiber disposed inside the water blocking layer and a water blocking material filling the space between the water blocking layer and the optical fiber, the water blocking material comprising a grease having a worked penetration of 150 to 450 at room temperature and of at least 85 at -30° C. as measured according to ASTM-D-217, said grease comprising an organic liquid having a viscosity at 40° C. of 6 to 5000 c.st. and 3 to 35 parts by weight per 100 parts by weight of said organic liquid of a thickener.
Claim 2
Dependent Claim
102 words
An optical fiber cable comprising a water blocking layer, an optical fiber disposed inside the water blocking layer and a water blocking material filling the space between the water blocking layer and the optical fiber, the water blocking material comprising a grease having a worked penetration of 150 to 450 at room temperature and of at least 85 at -30° C. as measured according to ASTM-D-217, said grease comprising an organic liquid having a viscosity at 40° C. of 6 to 5000 c.st. and 3 to 35 parts by weight per 100 parts by weight of said organic liquid of a thickener.
Claim 3
Dependent Claim
38 words
An optical fiber cable as defined in claim 1 wherein the water blocking material further comprises a water absorbing agent in an amount of 10 to 400 parts by weight per 100 parts by weight of the grease.
Claim 4
Dependent Claim
45 words
An optical fiber cable as defined in claim 1 wherein the grease is at least one member selected from the group consisting of calcium soap grease, aluminum soap grease, lithium soap grease, calcium complex soap grease, aluminum complex soap grease, bentonite grease, and polyurea grease.
References Cited (Backward Citations)
US4370023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |