Tetrasilicic mica glass-ceramic method
Abstract
Abstract THIS INVENTION RELATES TO THE PRODUCTION OF TETRASILICIC FLUORINE MICA GLASS-CERAMIC ARTICLES FROM THE CONTROLLED HEAT TREATMENT OF CRYSTALLIZABLE GLASSES CONTAINING, IN WEIGHT PERCENT ON THE OXIDE BASIS, 45-70% SIO2, 8-20% MGO, 8-15% MGF2, A TOTAL OF 5-35% (R2O+RO), WHEREIN R2O RANGES FROM ABOUT 5-25% AND CONSISTS OF ONE OR MORE OXIDES SELECTED IN THE INDICATED PROPORTIONS FROM THE GROUP CONSISTING OF 0-20% K2O, 0-23% RB2O AND 0-25% CS2O, AND WHEREIN RO RANGES FROM 0-20% AND CONSISTS OF ONE OR MORE OXIDES SELECTED FROM THE GROUP CONSISTING OF SRO, BAO AND CDO, A TOTAL OF 0-10% OF OXIDES SELECTED FROM THE GROUP CONSISTING OF AS2O5 AND SB2O5, AND TO ABOUT 5% OF GLASS COLORANTS. THESE TETRASILICIC MICA PRODUCTS EXHIBIT GOOD MACHINABILITY WITH STEEL TOOLS, GOOD MECHANICAL STRENGTH, MODERATE THERMAL EXPANSION AND GOOD CHEMICAL DURABILITY. THE USE OF THE OPTIONAL CONSTITUENTS AS2O5, SB2O5 AND THE GLASS COLORANTS PERMITS THE PRODUCTION OF TRANSLUCENT GLASS-CERAMICS AND GLASS-CERAMICS HAVING THE APPEARANCE OF MARBLE.
Inventors
- 👤 D Grossman
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |