US4664474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber and process for producing the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-05-02
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Granted: 1987-05-12
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Expires: 2004-05-02
Abstract
Abstract An optical fiber comprising core glass having therearound a cladding comprising fluorine-containing quartz glass and a process for producing the same are disclosed. Said cladding is composed of an inner portion having a prescribed thickness and a constant fluorine content through its thickness and an outer portion having its fluorine content being gradually decreased in a radial direction so that its outermost surface has a fluorine content of about 0.7% by weight or less relative to SiO 2 .
Inventors
- 👤 Gotaro Tanaka
- 👤 Kunio Fujiwara
- 👤 Yasuo Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
G; G03; G03F; G03F9/00; G03F9/70; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03616; G02B6/03622; G02B6/03627; C; C03; C03B; C03B23/00; C03B23/04; C03B23/047; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01214; C03B37/014; C03C; C03C13/00; C03C13/04; C03C13/045; G02B6/028; G02B6/0281; H; H10; H10P; H10P95/00; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/12; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/23
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
An optical fiber comprising core glass having therearound a cladding comprising fluorine-containing quartz glass, wherein said cladding is composed of an inner portion having a constant fluorine content through the thickness of the inner portion and an outer portion having a fluorine content which gradually decreases in a radial direction so that the outermost surface of the outer portion has a fluorine content of up to 0.7% by weight relative to SiO 2 .
Claim 2
Dependent Claim
74 words
An optical fiber comprising core glass having therearound a cladding comprising fluorine-containing quartz glass, wherein said cladding is composed of an inner portion having a constant fluorine content through the thickness of the inner portion and an outer portion having a fluorine content which gradually decreases in a radial direction so that the outermost surface of the outer portion has a fluorine content of up to 0.7% by weight relative to SiO 2 .
Claim 3
Dependent Claim
29 words
An optical fiber according to claim 1, wherein the fluorine content of the inner portion is about 1.5 to about 4% based on the weight of the quartz glass.
Claim 4
Dependent Claim
22 words
An optical fiber according to claim 1, wherein the thickness of the inner portion is 0.05 to 0.5 times the core diameter.
Claim 5
Dependent Claim
22 words
An optical fiber according to claim 4, wherein the thickness of the inner portion is 0.05 to 0.5 times the core diameter.
Claim 6
Dependent Claim
35 words
An optical fiber according to claim 1, wherein the ratio of the thickness of the outer portion of the cladding to the thickness of the inner portion of the cladding is from 0.04 to 0.2.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |