US2960802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a semicrystalline ceramic body
Assignee: Corning Glass Works
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Filing: 1958-11-12
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Granted: 1960-11-22
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Raymond O Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:07
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C10/0018; C03C10/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE METHOD OF HEAT TREATING A GLASS BODY CONSISTING ESSENTIALLY OF ABOUT 71% SIO2, 2.5% LI2O, 18% AL2O3, 4.5% TIO2, 3% MGO AND 1% ZNO BY WEIGHT TO CONVERT IT WITHOUT SUBSTANTIAL CHANGE OF SIZE AND SHAPE TO A SEMICRYSTALLINE BODY HAVING A MODULUS OF RUPTURE TO A SEMI13,000 P.S.I. AND A LOW LINEAR THERMAL EXPANSION COEFFICIENT, WHICH COMPRISES HEATING THE GLASS BODY AT A RATE NOT OVER 5*C. PER MINUTE TO ABOUT 800*C., HOLDING IT AT SUCH TEMPERATURE FOR ABOUT 1 HOUR, FURTHER HEATING IT AT A RATE OF NOT OVER 5*C. PER MINUTE TO 1080*-1120* C. AND HOLDING IT IN SUCH TEMPRATURE RANGE FOR ABOUT 4 HOURS AND COOLING IT AT A RATE OF AT LEAST ABOUT 5*C. PER MINUTE.
Claim 2
Independent Claim
122 words
THE METHOD OF HEAT TREATING A GLASS BODY CONSISTING ESSENTIALLY OF ABOUT 71% SIO2, 2.5% LI2O, 18% AL2O3, 4.5% TIO2, 3% MGO AND 1% ZNO BY WEIGHT TO CONVERT IT WITHOUT SUBSTANTIAL CHANGE OF SIZE AND SHAPE TO A SEMICRYSTALLINE BODY HAVING A MODULUS OF RUPTURE TO A SEMI13,000 P.S.I. AND A LOW LINEAR THERMAL EXPANSION COEFFICIENT, WHICH COMPRISES HEATING THE GLASS BODY AT A RATE NOT OVER 5*C. PER MINUTE TO ABOUT 800*C., HOLDING IT AT SUCH TEMPERATURE FOR ABOUT 1 HOUR, FURTHER HEATING IT AT A RATE OF NOT OVER 5*C. PER MINUTE TO 1080*-1120* C. AND HOLDING IT IN SUCH TEMPRATURE RANGE FOR ABOUT 4 HOURS AND COOLING IT AT A RATE OF AT LEAST ABOUT 5*C. PER MINUTE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |