US4160672A
Expired / Lapsed
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Glass-ceramics for semiconductor doping
Assignee: OI Glass Inc
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Filing: 1976-02-18
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Granted: 1979-07-10
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Expires: 1996-02-18
Abstract
Abstract Disclosed are B2O3-containing glass-ceramic bodies made by in situ thermal crystallization of glasses and useful as a host for diffusion doping of semiconductors by the vapor phase transport of B2O3 to the semiconductor from the glass-ceramic which in mole percent consists essentially of SiO2 15-40, Al2O3 15-30, B2O3 20-60, RO 5-25, La2O3 0-5, Nb2O5 0-5 and Ta2O5 0-5 wherein RO is selected from MgO, CaO, SrO and BaO in specified percentages, and mixtures thereof and wherein the ratio Al2O3 to RO is 1.5-4.
Inventors
- 👤 James E. Rapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:03
CPC Classifications
H; H10; H10P; H10P32/00; H10P32/10; H10P32/19; C; C03; C03C; C03C10/00; C03C10/0036; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C30; C30B; C30B31/00; C30B31/06; C30B31/16; C30B31/165; Y; Y10; Y10S; Y10S252/00; Y10S252/95
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
A glass-ceramic body resulting from the in situ thermal crystallization of a thermally crysytallizable substantially alkali metal oxide free glass having a composition in mole percent consisting essentially of SiO 2 15-40, Al 2 O 3 15-30, B 2 O 3 20-60, RO 5-25, La 2 O 3 0-5, Nb 2 O 5 0-5 and Ta 2 O 5 0-5, wherein Ro is one or more of MgO, CaO, SrO and BaO in the following mole percentages: MgO:0-15 CaO:0-10 SrO:0-10 BaO:0-15 and wherein the ratio Al 2 O 3 /RO is 1.5-4.
Claim 2
Dependent Claim
92 words
A glass-ceramic body resulting from the in situ thermal crystallization of a thermally crysytallizable substantially alkali metal oxide free glass having a composition in mole percent consisting essentially of SiO 2 15-40, Al 2 O 3 15-30, B 2 O 3 20-60, RO 5-25, La 2 O 3 0-5, Nb 2 O 5 0-5 and Ta 2 O 5 0-5, wherein Ro is one or more of MgO, CaO, SrO and BaO in the following mole percentages: MgO:0-15 CaO:0-10 SrO:0-10 BaO:0-15 and wherein the ratio Al 2 O 3 /RO is 1.5-4.
Claim 3
Dependent Claim
61 words
A glass-ceramic body of claim 1 resulting from the in situ thermal crystallization of a thermally crystallizable substantially alkali metal oxide free glass having a composition in mole percent consisting essentially of SiO 2 18-40, Al 2 O 3 15-30, B 2 O 3 30-60 and RO 5-15 including 3-15 MgO, wherein the ratio Al 2 O 3 /RO is 2-4.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |