Patent US4197136A successfully refreshed from Google Patents.
US4197136A
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Optical transmission line glass and its method of manufacture
Assignee: Fujitsu Ltd
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Filing: 1977-10-31
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Granted: 1980-04-08
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Expires: 1997-10-31
Abstract
Abstract Optical transmission line glass includes phosphorus pentoxide and germanium dioxide as the major glass forming oxides and gallium trioxide for waterproofing and refractive index control. A method of manufacture of such glass material utilizes a gas phase chemical reaction.
Inventors
- 👤 Kozo Inoue
- 👤 Junjiro Goto
- 👤 Yoshio Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:02
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/253; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/022; C03B37/023; C03B5/00; C03B5/16; C03B5/18; C03B5/193; C03B5/225; C03C13/00; C03C13/04; C03C13/048; C03C3/16; C03B2201/00; C03B2201/06; C03B2201/20; C03B2201/28; C03B2201/60; C03B2201/70; C03B2201/78; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
Optical transmission line glass having an improved waterproof property, consisting essentially of 10 to 58 weight % of phosphoric pentoxide P 2 O 5 ; 15 to 85 weight % of germanium dioxide GeO 2 ; and 5 to 40 weight % of gallium trioxide Ga 2 O 3 , said gallium trioxide being added to control the refractive index in values of less than 1.61 with said refractive index decreasing substantially linearly with increasing gallium trioxide.
Claim 2
Dependent Claim
77 words
Optical transmission line glass having an improved waterproof property, consisting essentially of 10 to 58 weight % of phosphoric pentoxide P 2 O 5 ; 15 to 85 weight % of germanium dioxide GeO 2 ; and 5 to 40 weight % of gallium trioxide Ga 2 O 3 , said gallium trioxide being added to control the refractive index in values of less than 1.61 with said refractive index decreasing substantially linearly with increasing gallium trioxide.
Claim 3
Dependent Claim
32 words
Optical transmission line glass having an improved waterproof property as claimed in claim 1, wherein the gallium trioxide Ga 2 O 3 is in an amount of at least 10 weight %.
Claim 4
Dependent Claim
67 words
Optical transmission line glass having an improved waterproof property, consisting essentially of 75 to 90% of total weight of phosphoric pentoxide P 2 O 5 and germanium dioxide GeO 2 mixed in a weight ratio of 4:6; and 10 to 25 weight % of gallium trioxide, said gallium trioxide being added to control the refractive index with said refractive index decreasing substantially linearly with increasing gallium trioxide.
Claim 5
Dependent Claim
67 words
Optical transmission line glass having an improved waterproof property, consisting essentially of 75 to 90% of total weight of phosphoric pentoxide P 2 O 5 and germanium dioxide GeO 2 mixed in a weight ratio of 4:6; and 10 to 25 weight % of gallium trioxide, said gallium trioxide being added to control the refractive index with said refractive index decreasing substantially linearly with increasing gallium trioxide.
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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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |