US4733939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-resistant optical conductor
Assignee: Dainichi Nippon Cables Ltd
•
Filing: 1985-08-08
•
Granted: 1988-03-29
•
Expires: 2005-08-08
Abstract
Abstract It is disclosed that a radiation-resistant optical conductor, such as an optical fiber for telecommunication, a multiple fiber for an image scope, and a light guide for illumination, which comprises a core composed of a pure silica glass which is prepared via an ultrahigh temperature of at least 3,000 DEG C. and has an OH group content of from 0.1 to 300 ppm, and a cladding layer formed on the core, and the cladding layer being composed of a silica glass which contains boron element and fluorine element as a dopant.
Inventors
- 👤 Atsushi Utsumi
- 👤 Hiroyuki Hayami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:51
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/10; C03B19/1005; C03B19/106; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01214; C03B37/014; C03B37/01413; C03B37/0142; C03B37/01426; C03B37/018; C03B37/01807; C03B37/01815; C03B37/01823; C03B37/0183; C03B37/02; C03B37/025; C03B37/027; C03B37/028; C03C; C03C13/00; C03C13/04; C03C13/045; G; G02; G02B; G02B6/00; G02B6/02; G02B6/04; G02B6/06; C03B2201/00; C03B2201/02; C03B2201/03; C03B2201/04; C03B2201/06; C03B2201/08; C03B2201/14; C03B2201/20; C03B2201/23; C03B2203/00; C03B2203/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A radiation-resistant optical conductor which comprises a core composed of a pure silica glass which is prepared via an ultrahigh temperature of at least 3,000° C. and has an OH group content of from 0.1 to 300 ppm, and a cladding layer formed on the core, the cladding layer being composed of a silica glass which contains boron element and fluorine element as a dopant.
Claim 2
Dependent Claim
65 words
A radiation-resistant optical conductor which comprises a core composed of a pure silica glass which is prepared via an ultrahigh temperature of at least 3,000° C. and has an OH group content of from 0.1 to 300 ppm, and a cladding layer formed on the core, the cladding layer being composed of a silica glass which contains boron element and fluorine element as a dopant.
Claim 3
Dependent Claim
35 words
A radiation-resistant optical conductor of claim 1, wherein said pure silica glass is prepared via an ultrahigh temperature of at least 4,000° C., and has an OH group content of from 0.5 to 300 ppm.
Claim 4
Dependent Claim
23 words
A radiation-resistant optical conductor of claim 1, wherein said pure silica glass is prepared by using an argon plasma or an oxygen plasma.
Claim 5
Dependent Claim
18 words
A radiation-resistant optical conductor of claim 1, wherein said cladding layer is provided with a support layer thereon.
Claim 6
Dependent Claim
40 words
A radiation-resistant optical conductor of claim 1, wherein the value d 1 /d 2 is from 0.45 to 0.9, wherein d 1 is the outer diameter of the core and d 2 is the outer diameter of the cladding layer.
Claim 7
Dependent Claim
23 words
A radiation-resistant optical conductor as in anyone of claims 1 to 5, wherein said optical conductor is an optical fiber used for telecommunication.
Claim 8
Dependent Claim
25 words
A radiation-resistant optical conductor as in anyone of claims 1 to 5, wherein said optical conductor is a multiple fiber used for an image scope.
Claim 9
Dependent Claim
23 words
A radiation-resistant optical conductor as in anyone of claims 1 to 5, wherein said optical conductor is a light guide used for illumination.
References Cited (Backward Citations)
US4566754A
Cited
JPS5872107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |