US4804247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quartz glass optical fiber
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1985-04-04
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Granted: 1989-02-14
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Expires: 2005-04-04
Abstract
Abstract A quartz optical fiber comprising a core having a higher refractive index and made of pure quartz containing fluorine and phosphorus pentoxide and a cladding having a lower refractive index, a weight ratio of fluorine and phosphorus pentoxide in the core being larger than 1 (one), which is substantially free from unstability of the glass structure.
Inventors
- 👤 Michihisa Kyoto
- 👤 Shuzo Suzuki
- 👤 Minoru Watanabe
- 👤 Motohiro Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; G; G02; G02B; G02B6/00; G02B6/02; G02B6/10; Y; Y10; Y10S; Y10S65/00; Y10S65/15; Y10S65/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
A quartz optical fiber comprising a core having a higher refractive index and made of pure quartz containing fluorine and phosphorus pentoxide and a cladding having a lower refractive index, a weight ratio of fluorine and phosphorus pentoxide in the core being larger than 1 (one).
Claim 2
Dependent Claim
46 words
A quartz optical fiber comprising a core having a higher refractive index and made of pure quartz containing fluorine and phosphorus pentoxide and a cladding having a lower refractive index, a weight ratio of fluorine and phosphorus pentoxide in the core being larger than 1 (one).
Claim 3
Dependent Claim
20 words
A quartz optical fiber according to claim 1, wherein the amount of fluorine is not larger than 3% by weight.
Claim 4
Dependent Claim
20 words
A quartz optical fiber according to claim 1, wherein the amount of phosphorus pentoxide is less than 3% by weight.
Claim 5
Dependent Claim
20 words
A quartz optical fiber according to claim 3, wherein the amount of phosphorus pentoxide is less than 1.0% by weight.
Claim 6
Dependent Claim
15 words
A quartz optical fiber according to claim 1, wherein the core contains GeO 2 .
Claim 7
Dependent Claim
22 words
A quartz optical fiber according to claim 5, wherein the amount of the GeO 2 is not larger than 17% by weight.
References Cited (Backward Citations)
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JPS60141643A
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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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |