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US4282282A
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Barium aluminosilicate glasses, glass-ceramics and dopant
Assignee: Techneglas LLC
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Filing: 1977-10-03
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Granted: 1981-08-04
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Expires: 1997-10-03
Abstract
Abstract Disclosed are thermally crystallizable glass compositions, glass ceramics and dopant hosts made therefrom, wherein said dopant hosts in thin wafer form have improved resistance to warpage, said compositions containing SiO2, Al2O3, MgO, BaO, and B2O3.
Inventors
- 👤 James E. Rapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:02
CPC Classifications
H; H10; H10P; H10P32/00; H10P32/10; H10P32/19; Y; Y10; Y10S; Y10S252/00; Y10S252/95; Y10S252/951
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A glass thermally crystallizable to a glass-ceramic body, which glass is substantially free of alkai metal oxides and consists essentially of, in mole percent: ______________________________________
Component Mole Percent
______________________________________
SiO.sub.2 45-52
Al.sub.2 O.sub.3
18.5-22.5
B.sub.2 O.sub.3
20-25
MgO 2.5-4.5
BaO 3.5-5.5
______________________________________ with the following molar ratios: SiO 2 /Al 2 O 3 >2.1 SiO 2 /B 2 O 3 <2.3 Al 2 O 3 /(MgO+BaO) 2.1-3.1
Claim 2
Dependent Claim
67 words
A glass thermally crystallizable to a glass-ceramic body, which glass is substantially free of alkai metal oxides and consists essentially of, in mole percent: ______________________________________
Component Mole Percent
______________________________________
SiO.sub.2 45-52
Al.sub.2 O.sub.3
18.5-22.5
B.sub.2 O.sub.3
20-25
MgO 2.5-4.5
BaO 3.5-5.5
______________________________________ with the following molar ratios: SiO 2 /Al 2 O 3 >2.1 SiO 2 /B 2 O 3 <2.3 Al 2 O 3 /(MgO+BaO) 2.1-3.1
Claim 3
Dependent Claim
19 words
A glass of claim 1 wherein the sum total of alkali metal oxides is less than 0.1 mole percent.
Claim 4
Dependent Claim
16 words
A glass-ceramic body resulting from the thermal in situ crystallization of a glass of claim 1.
Claim 5
Dependent Claim
16 words
A glass-ceramic body resulting from the thermal in situ crystallization of a glass of claim 2.
Claim 6
Dependent Claim
45 words
A glass ceramic body of claim 3 which is a dopant host in wafer form having a thickness of no more than 0.1 inch, said dopant host having excellent resistance to warpage when repeatedly cycled between temperatures below 900° C. and temperatures above 1050° C.
Claim 7
Dependent Claim
44 words
A glass-ceramic body of claim 4 which is a dopant host in wafer form having a thickness of no more than 0.1 inch, said dopant host having excellent resistance to warpage when repeatedly cycled between temperatures below 900° C. and temperatures above 1050° C.
References Cited (Backward Citations)
US3998667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |