US4553995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing image fiber
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-09-28
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Granted: 1985-11-19
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Expires: 2004-09-28
Abstract
Abstract A process for producing an image fiber comprising drawing an image fiber preform consisting of a bundle of a plurality of optical fibers each of which is drawn from an optical fiber preform and consists of a core and a cladding, in which at least one of the optical fiber preform, the optical fiber, the image fiber preform and the image fiber is hydrogenated at a temperature higher than a room temperature, the image fiber produced having improved attenuation which is less increased when it is irradiated, particularly with gamma-ray.
Inventors
- 👤 Yoshiki Chigusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:34
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01446; C03B37/02; C03B37/025; C03B37/027; C03B37/028; C03B37/10; C03B37/14; C03B37/15; C03C; C03C25/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A process for producing an image fiber comprising drawing an image fiber preform consisting of a bundle of a plurality of optical fibers each of which is drawn from an optical fiber preform and consists of a core and a cladding, in which at least one of the optical fiber preform, the optical fiber, the image fiber preform and the image fiber is hydrogenated at a temperature higher than a room temperature in a gas containing hydrogen at a partial pressure of at least 0.05 atmosphere.
Claim 2
Dependent Claim
86 words
A process for producing an image fiber comprising drawing an image fiber preform consisting of a bundle of a plurality of optical fibers each of which is drawn from an optical fiber preform and consists of a core and a cladding, in which at least one of the optical fiber preform, the optical fiber, the image fiber preform and the image fiber is hydrogenated at a temperature higher than a room temperature in a gas containing hydrogen at a partial pressure of at least 0.05 atmosphere.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein the optical fiber preform is hydrogenated.
Claim 4
Dependent Claim
12 words
A process according to claim 1, wherein the optical fiber is hydrogenated.
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein the image fiber preform is hydrogenated.
Claim 6
Dependent Claim
12 words
A process according to claim 1, wherein the image fiber is hydrogenated.
Claim 7
Dependent Claim
26 words
A process according to claim 1, wherein all of the optical fiber preform, the optical fiber, the image fiber preform and the image fiber are hydrogenated.
Claim 8
Dependent Claim
16 words
A process according to claim 1, wherein the hydrogenation is carried out in pure hydrogen gas.
Claim 9
Dependent Claim
25 words
A process according to claim 1, wherein the hydrogenation is carried out in air containing hydrogen at a partial pressure of at least 0.05 atm.
Claim 10
Dependent Claim
15 words
A process according to claim 1, wherein the hydrogenation temperature is lower than 1,600° C.
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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) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |