US4634683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barium and/or strontium aluminosilicate crystal-containing glasses for flat panel display devices
Assignee: Corning Glass Works
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Filing: 1985-10-23
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Granted: 1987-01-06
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Expires: 2005-10-23
Abstract
Abstract This invention is directed to the fabrication of flat panel display devices wherein a film of large crystal polysilicon is grown on a substrate. More specifically, this invention is drawn to the fabrication of such devices wherein the substrate is fashioned from a phase separated glass consisting essentially of extremely fine-grained crystals homogeneously dispersed in a glass matrix, the base glass therefor being essentially free from alkali metal oxide and consisting essentially, in mole percent, of 2-6% BaO and/or SrO, 18-26% Al 2 O 3 , and 68-80% SiO 2 .
Inventors
- 👤 William H. Dumbaugh, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:24
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A phase separated glass essentially free from alkali metal oxide consisting of extremely fine-grained crystals homogeneously dispersed in a glass matrix, said glass exhibiting transparency, an annealing point higher than 900° C., a linear coefficient of thermal expansion over the temperature range of 25°-300° C. between about 30-40×10 -7 /°C., and consisting essentially, expressed in terms of mole percent on the oxide basis, of about SiO 2 : 68-80 Al 2 O 3 : 18-26 BaO and/or SrO: 2-6.
Claim 2
Dependent Claim
79 words
A phase separated glass essentially free from alkali metal oxide consisting of extremely fine-grained crystals homogeneously dispersed in a glass matrix, said glass exhibiting transparency, an annealing point higher than 900° C., a linear coefficient of thermal expansion over the temperature range of 25°-300° C. between about 30-40×10 -7 /°C., and consisting essentially, expressed in terms of mole percent on the oxide basis, of about SiO 2 : 68-80 Al 2 O 3 : 18-26 BaO and/or SrO: 2-6.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |