Method for producing glass precursor compositions and glass compositions therefrom
Abstract
Abstract AN IMPROVED PROCESS FOR PREPARING INORGANIC, OXIDIC, GLASS PRECURSOR COMPOSITIONS CORRESPONDING TO A GLASS CONSISTING ESSENTIALLY OF SILICA, BORIC OXIDE, LEAD OXIDE, AND, OPTIONALLY, ALUMINA OR ZINC OXIDE OR MIXTURES OF ALUMINA AND ZINC OXIDE, WHEREIN THE GLASS HAS A SINTERING TEMPERATURE IN THE RANGE OF ABOUT 300*C. TO ABOUT 600* C. AND MELTS TO A UNIFORM GLASS PRODUCT AT A TEMPERATURE OF LESS THAN ABOUT 860*C. BY A PROCESS WHEREIN A CLEAR SOLUTION OF A FURTHER HYDROLYZABLE METALLOSILOXANE IS PROVIDED AND THERE IS INCORPORATED THEREIN LEAD OXIDE AND, WHEN PRESENT, ZINC OXIDE, TO FORM IN THE CLEAR SOLUTION A UNIFORM DISPERSION OF THESE OXIDES, AFTER WHICH THE SYSTEM IS FURTHER HYDROLYZED SO AS TO FORM A UNIFORM GEL AND THE GEL IS APPROPRIALTELY HEATED AND CALCINED TO PRODUCE SUBSTANTIALLY A CARBON-FREE, INORGANIC GLASS PRECURSOR WHICH, UPON FURTHER HEATING, FROMS A COLORLESS GLASS.
Inventors
- 👤 I Thomas
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |