US3723080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange strengthened electrically-heated glass
Assignee: Corning Glass Works
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Filing: 1971-02-12
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Granted: 1973-03-27
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Expires: 1991-02-12
Abstract
Abstract CHEMICALLY STRENGTHENED, ELECTRICALLY-HEATABLE GLASS FOR VEHICLE WINDOWS AND THE LIKE, AND A METHOD OF MAKING IT, COMPRISING THE STEPS OF COATING AT LEAST ONE SURFACE OF A SODA ALUMINOSILICATE GLASS WITH AN ELECTROCONDUCTIVE PASTE TO FORM A RESISTANCE HEATING GRID, DRYING, FIRING THE COATED GLASS TO A TEMPERATURE SUFFICIENT TO FUSE THE PASTE, AND IF DESIRED, TO SAG THE GLASS, AND FINALLY SUBJECTING THE FIRED GLASS TO A SOURCE OF EXCHANGEABLE K+ IONS AT A TEMPERATURE BELOW THE STRAIN POINT OF THE GLASS FOR A TIME SUFFICIENT TO FORM A COMPRESSIVELY STRESSED SURFACE LAYER THEREON.
Inventors
- 👤 R Howell
- 👤 J Panzarino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:20
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; C; C03; C03C; C03C17/00; C03C17/06; C03C21/00; C03C21/001; C03C21/005; H01; H01B; H01B1/00; H01B1/14; H01B1/16; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2218/00; C03C2218/10; C03C2218/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |