US4634684A
Expired / Lapsed
US
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Strontium aluminosilicate glass substrates 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 concerned with the fabrication of flat panel display devices wherein a film of large crystal polysilicon is grown on a substrate. More particularly, the present invention is drawn to such devices wherein the substrate is prepared from a strontium aluminosilicate glass consisting essentially, in mole percent, of about 9-12% SrO, 9-12% Al 2 O 3 , and 77-82% 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; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C4/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A clear, transparent, homogeneous strontium aluminosilicate glass capable of being melted at temperatures no higher than about 1800° C. which exhibits an annealing point greater than 875° C., a linear coefficient of thermal expansion over the temperature range of 25°-300° C. of about 30-40×10 -7 /°C., a liquidus temperature not exceeding about 1400° C., and a liquidus viscosity of at least 1×10 5 poises, said glass being essentially free from alkali metal oxide, MgO, CaO, ZnO, La 2 O 3 , and MnO, and consisting essentially, expressed in terms of mole percent on the oxide basis, of about 9-12% SrO, 9-12% Al 2 O 3 , 77-82% SiO 2 .
Claim 2
Dependent Claim
110 words
A clear, transparent, homogeneous strontium aluminosilicate glass capable of being melted at temperatures no higher than about 1800° C. which exhibits an annealing point greater than 875° C., a linear coefficient of thermal expansion over the temperature range of 25°-300° C. of about 30-40×10 -7 /°C., a liquidus temperature not exceeding about 1400° C., and a liquidus viscosity of at least 1×10 5 poises, said glass being essentially free from alkali metal oxide, MgO, CaO, ZnO, La 2 O 3 , and MnO, and consisting essentially, expressed in terms of mole percent on the oxide basis, of about 9-12% SrO, 9-12% Al 2 O 3 , 77-82% SiO 2 .
Claim 3
Dependent Claim
17 words
A glass according to claim 1 wherein up to 8 mole percent BaO is substituted for SrO.
References Cited (Backward Citations)
US3962117A
Cited
US4180618A
Cited
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 |