US3689293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mica glass-ceramics
Assignee: Corning Glass Works
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Filing: 1970-07-08
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Granted: 1972-09-05
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Expires: 1990-07-08
Abstract
Abstract THIS INVENTION RELATES TO THE PRODUCTION OF FLUORINE MICA GLASS-CERAMIC ARTICLES FROM GLASS ARTICLES IN THE COMPOSITION SYSTEM SIO2-B2O3-AL2O3-MGO-K2O-F WHICH ARE ABOUT 50-90% BY VOLUME CRYSTALLINE, THE CRYSTALS BEING RELATED IN STRUCTURE AND COMPOSITION TO THE NATURAL MINERAL PHLOGOPITE. THESE MICA GLASS-CERAMIC PRODUCTS EXHIBIT GOOD MACHINEABILITY WITH STEEL TOOLS, GOOD MECHANICAL STRENGTH AND IMPACT RESISTANCE, EXCELLENT THERMAL SHOCK RESISTANCE, AND SUPERIOR DIELECTRIC PROPERTIES.
Inventors
- 👤 George H Beall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:04
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/16
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |