US3272610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making high strength devitrified glass bodies
Assignee: Corning Glass Works
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Filing: 1962-08-08
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Granted: 1966-09-13
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Expires: 1982-08-08
Abstract
No abstract record available.
Inventors
- 👤 Richard A Eppler
- 👤 John F Macdowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN THE METHOD FOR MANUFACTURING A GLASS-CERAMIC BODY POSSESSING A MODULUS OF AT LEAST ABOUT 30,000 P.S.I. AND A LINEAR COEFFICIENT OF THERMAL EXPANSION OF NOT MORE THAN ABOUT 70X10**-70C., THE IMPROVEMENT WHICH CONSISTS IN MELTING A GLASS-FORMING COMPOSITION CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF 16-19.5% BAO, 7-10% MGO, 16.5-19% AI2O3, 46-49% SIO2, AND 6-12% TIO2, THE TOTAL OF SAID BAO, MGO, AL203, SIO2 AND TIO2 CONSISTING AT LEAST 95% BY WEIGHT OF SAID GLASS, SIMULTANEOUSLY COOLING THE MELT BELOW THE TRANSFORMATION POINT OF SAID MELT AND FORMING A GLASS SHAPE THEREFROM, THEREAFTER HEATING SAID GLASS SHAPE TO A TEMPERATURE OF AT LEAST ABOUT 1100*C., BUT NOT MORE THAN ABOUT 1175* C., FOR A TIME SUFFICIENT TO OBTAIN CRYSTALLIZATION CONSISTING ESSENTIALLY OF HEXACELSIAN AND MAGNESIUM DITITANATE, AND THEN COOLING THE CRYSTALLIZED SHAPE TO ROOM TEMPERATURE.
Claim 2
Dependent Claim
138 words
IN THE METHOD FOR MANUFACTURING A GLASS-CERAMIC BODY POSSESSING A MODULUS OF AT LEAST ABOUT 30,000 P.S.I. AND A LINEAR COEFFICIENT OF THERMAL EXPANSION OF NOT MORE THAN ABOUT 70X10**-70C., THE IMPROVEMENT WHICH CONSISTS IN MELTING A GLASS-FORMING COMPOSITION CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF 16-19.5% BAO, 7-10% MGO, 16.5-19% AI2O3, 46-49% SIO2, AND 6-12% TIO2, THE TOTAL OF SAID BAO, MGO, AL203, SIO2 AND TIO2 CONSISTING AT LEAST 95% BY WEIGHT OF SAID GLASS, SIMULTANEOUSLY COOLING THE MELT BELOW THE TRANSFORMATION POINT OF SAID MELT AND FORMING A GLASS SHAPE THEREFROM, THEREAFTER HEATING SAID GLASS SHAPE TO A TEMPERATURE OF AT LEAST ABOUT 1100*C., BUT NOT MORE THAN ABOUT 1175* C., FOR A TIME SUFFICIENT TO OBTAIN CRYSTALLIZATION CONSISTING ESSENTIALLY OF HEXACELSIAN AND MAGNESIUM DITITANATE, AND THEN COOLING THE CRYSTALLIZED SHAPE TO ROOM TEMPERATURE.
References Cited (Backward Citations)
US2920971A
Cited
US3201266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |