US4679899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber
Assignee: Fujikura Ltd
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Filing: 1985-02-28
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Granted: 1987-07-14
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Expires: 2005-02-28
Abstract
Abstract An optical fiber of a silica-based material includes a coating of cured silicone rubber covering an outer surface thereof. The cured silicone rubber coating, when subjected to an infrared spectroscopic measurement, has a transmissivity of not less than 70% at a wave number of 2100 to 2200 cm -1 at a coating thickness of 0.1 mm due to the infrared absorption due to the stretching and vibration of SiH. The coating of cured silicone rubber contains a neglibible amount of SiH so that the transmission loss of the optical fiber can be prevented from increasing over a long period of time.
Inventors
- 👤 Toshiaki Kobayashi
- 👤 Kazuo Sanada
- 👤 Toshiaki Murayama
- 👤 Yasuyuki Sugawara
- 👤 Naoshi Uesugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:59
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/1065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
An optical fiber of a silica-based material having a coating of cured silicone rubber covering an outer surface thereof, said cured silicone rubber coating, when subjected to an infrared spectroscopic measurement, having a transmissivity of not less than 70% at a wave number of 2100 to 2200 cm -1 at a coating thickness of 0.1 mm due to the infrared absorption due to the stretching and vibration of SiH.
Claim 2
Dependent Claim
69 words
An optical fiber of a silica-based material having a coating of cured silicone rubber covering an outer surface thereof, said cured silicone rubber coating, when subjected to an infrared spectroscopic measurement, having a transmissivity of not less than 70% at a wave number of 2100 to 2200 cm -1 at a coating thickness of 0.1 mm due to the infrared absorption due to the stretching and vibration of SiH.
Claim 3
Dependent Claim
72 words
An optical fiber according to claim 1, produced by a process comprising the steps of: (a) applying thermosetting silicone rubber to said optical fiber to form a coating; and (b) curing said thermosetting coating in an atmosphere containing not more than 10% by volume of oxygen at a curing temperature higher than the temperature at which said thermosetting coating begins to be burnt in the air containing 20% by volume of oxygen.
Claim 4
Dependent Claim
19 words
An optical fiber produced by the process according to claim 2, in which said atmosphere further containing helium gas.
Claim 5
Dependent Claim
47 words
An optical fiber produced by the process according to claim 3, in which the step of curing said thermosetting coating is effected by heating said coating at a temperature lower than said curing temperature, and subsequently heating said coating at a temperature equal to said curing temperature.
Claim 6
Dependent Claim
47 words
An optical fiber produced by the process according to claim 2, in which the step of curing said thermosetting coating is effected by heating said coating at a temperature lower than said curing temperature, and subsequently heating said coating at a temperature equal to said curing temperature.
Claim 7
Dependent Claim
31 words
An optical fiber according to claim 1, in which at least one coating layer is interposed between the outer surface of the optical fiber and said coating of cured silicone rubber.
References Cited (Backward Citations)
US3508950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |