US5114884A
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Alkali bismuth gallate glasses
Assignee: Corning Inc
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Filing: 1991-04-26
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Granted: 1992-05-19
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Expires: 2011-04-26
Abstract
Abstract This invention relates to the preparation of thermally stable, chemically durable, heavy metal oxide glasses exhibiting good transmission of infrared radiation to wavelengths of about 7 microns consisting essentially, in weight percent, of 7.5-25% Ga 2 O 3 , 70-92% Bi 2 O 3 , and 0.25-12% R 2 O, wherein R 2 O consists of at least one alkali metal oxide selected from the group consisting of Na 2 O and K 2 O.
Inventors
- 👤 Josef C. Lapp
- 👤 Mark L. Powley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:28
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/122; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
Thermally stable, chemically durable, heavy metal oxide glasses exhibiting good transmission of infrared radiation to wavelengths of about 7 microns, consisting essentially, expressed in terms of weight per cent on the oxide basis, of 7.5-25% Ga 2 O 3 , 70-92% Bi 2 O 3 , and 0.25-12% R 2 O, wherein R 2 O consists of at least one alkali metal oxide selected from the group consisting of Na 2 O, and K 2 O.
Claim 2
Dependent Claim
76 words
Thermally stable, chemically durable, heavy metal oxide glasses exhibiting good transmission of infrared radiation to wavelengths of about 7 microns, consisting essentially, expressed in terms of weight per cent on the oxide basis, of 7.5-25% Ga 2 O 3 , 70-92% Bi 2 O 3 , and 0.25-12% R 2 O, wherein R 2 O consists of at least one alkali metal oxide selected from the group consisting of Na 2 O, and K 2 O.
Claim 3
Dependent Claim
29 words
The heavy metal oxide glasses according to claim 1 consisting essentially of 0.5-10% R 2 O, 10-22% Ga 2 O 3 , and 75-90% Bi 2 O 3 .
Claim 4
Dependent Claim
25 words
The heavy metal oxide glasses according to claim 1 wherein up to 50% of the R 2 O is replaced with an alkali metal halide.
Claim 5
Dependent Claim
14 words
The heavy metal oxide glasses according to claim 3 wherein said halide is chloride.
References Cited (Backward Citations)
US4483931A
Cited
US4456692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |