Patent US4994415A successfully refreshed from Google Patents.
US4994415A
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SiO2 -Al2 O3 -BaO glass substrates with improved chemical resistance for use in display panels and others having thin films
Assignee: Nippon Electric Glass Co Ltd
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Filing: 1989-05-25
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Granted: 1991-02-19
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Expires: 2009-05-25
Abstract
Abstract Substrates for use in liquidus crystal display devices using thin film transistors, solar cells electroluminescence display devices and/or other devices having a thin film formed on the substrate are formed of a glass. The glass is essentially free from alkali metal oxide, lead oxide, and magnesium oxide, and has a high chemical resistance. The glass consists essentially, by weight, of 52-60% SiO2, 7-14% Al2O3, 3-12% B2O3, 3-13% CaO, 10-22% BaO, 0-10% SrO, 0-10% ZnO.
Inventors
- 👤 Katsuhiko Imai
- 👤 Shigeru Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:16
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; H; H10; H10F; H10F77/00; H10F77/10; H10F77/16; H10F77/169; Y; Y02; Y02E; Y02E10/00; Y02E10/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A substrate for use in an electronic display device, a solar cell and/or other devices having a thin film formed on the substrate, said thin film forming an electric circuit by photo-etching treatment, wherein said substrate is comprised of a glass essentially free from alkali metal oxide, lead oxide and magnesium oxide, the glass having a high chemical resistance and consisting essentially of 55-58% SiO 2 , 8-13% Al 2 O 3 , 4-10% B 2 O 3 , 4-7% CaO, 11-20% BaO, 0-5% SrO and 0.5-7% ZnO, all by weight.
Claim 2
Dependent Claim
91 words
A substrate for use in an electronic display device, a solar cell and/or other devices having a thin film formed on the substrate, said thin film forming an electric circuit by photo-etching treatment, wherein said substrate is comprised of a glass essentially free from alkali metal oxide, lead oxide and magnesium oxide, the glass having a high chemical resistance and consisting essentially of 55-58% SiO 2 , 8-13% Al 2 O 3 , 4-10% B 2 O 3 , 4-7% CaO, 11-20% BaO, 0-5% SrO and 0.5-7% ZnO, all by weight.
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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |