Patent US2933857A successfully refreshed from Google Patents.
US2933857A
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Method of making a semicrystalline ceramic body
Assignee: Corning Glass Works
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Filing: 1958-12-15
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Granted: 1960-04-26
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Expires: 1978-12-15
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0018; C03C10/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF MAKING A SEMICRYSTALLINE CERAMIC BODY HAVING A HIGH THERMAL EXPANSION COEFFICIENT, WHICH COMPRISES HEAT TREATING A GLASS BODY COMPRISING 85-92% SIO2, 6.5-15% AT LEAST ONE OF THE ALKALI METAL OXIDES NA2O AND K2O, 0.8% AL2O3 AND O-5% F BY WEIGHT, THE TOTAL SIO2+NA2O+K2O AMOUNTING TO AT LEAST 92%, BY HEATING IT BETWEEN 650*C. AND 125*C. UNTIL ITS LINEAR THERMAL EXPANSION COEFFICENT HAS INCREASED TO ABOVE 175X10**7 PER *C., BETWEEN 0* AND 300*C.
Claim 2
Independent Claim
75 words
THE METHOD OF MAKING A SEMICRYSTALLINE CERAMIC BODY HAVING A HIGH THERMAL EXPANSION COEFFICIENT, WHICH COMPRISES HEAT TREATING A GLASS BODY COMPRISING 85-92% SIO2, 6.5-15% AT LEAST ONE OF THE ALKALI METAL OXIDES NA2O AND K2O, 0.8% AL2O3 AND O-5% F BY WEIGHT, THE TOTAL SIO2+NA2O+K2O AMOUNTING TO AT LEAST 92%, BY HEATING IT BETWEEN 650*C. AND 125*C. UNTIL ITS LINEAR THERMAL EXPANSION COEFFICENT HAS INCREASED TO ABOVE 175X10**7 PER *C., BETWEEN 0* AND 300*C.
References Cited (Backward Citations)
US1932202A
Cited
GB444532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |