US5116789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strontium aluminosilicate glasses for flat panel displays
Assignee: Corning Inc
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Filing: 1991-08-12
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Granted: 1992-05-26
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Expires: 2011-08-12
Abstract
Abstract The invention is concerned with glasses for use as substrates in flat panel display devices which use polycrystalline silicon thin film transistors. The compositions for these glasses are essentially free from alkali metal oxides and MgO and consist essentially, in mole percent, of: ______________________________________ SiO 2 65-75 CaO and/or BaO 0-10 Al 2 O 3 6-10 B 2 O 3 0-5 SrO 15-26 [CaO and/or BaO] + B 2 O 3 0-12 ______________________________________
Inventors
- 👤 William H. Dumbaugh, Jr.
- 👤 Josef C. Lapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:02
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/089; C03C3/091; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
In a flat panel display device containing a flat, transparent glass substrate carrying polycrystalline silicon thin film transistors, the improvement wherein said glass is capable of being melted at temperatures not exceeding about 1600° C., it exhibits a strain point over 675° C., a liquidus temperature no higher than 1325° C., a long term stability when in contact with platinum metal and high temperature refractory ceramic materials, and, being essentially free from alkali metal oxides and MgO, consists essentially, expressed in terms of mole percent on the oxide basis, of: ______________________________________
SiO.sub.2
67-70 CaO and/or BaO 0-10
Al.sub.2 O.sub.3
7-9 B.sub.2 O.sub.3 0-5
SrO 21-25 [CaO and/or BaO] + B.sub.2 O.sub.3
0-12.
______________________________________
Claim 2
Dependent Claim
113 words
In a flat panel display device containing a flat, transparent glass substrate carrying polycrystalline silicon thin film transistors, the improvement wherein said glass is capable of being melted at temperatures not exceeding about 1600° C., it exhibits a strain point over 675° C., a liquidus temperature no higher than 1325° C., a long term stability when in contact with platinum metal and high temperature refractory ceramic materials, and, being essentially free from alkali metal oxides and MgO, consists essentially, expressed in terms of mole percent on the oxide basis, of: ______________________________________
SiO.sub.2
67-70 CaO and/or BaO 0-10
Al.sub.2 O.sub.3
7-9 B.sub.2 O.sub.3 0-5
SrO 21-25 [CaO and/or BaO] + B.sub.2 O.sub.3
0-12.
______________________________________
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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |