US2920971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making ceramics and product thereof
Assignee: Corning Glass Works
•
Filing: 1956-06-04
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Granted: 1960-01-12
•
Expires: 1976-06-04
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:36
CPC Classifications
C; C03; C03C; C03C10/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
THE METHOD OF MAKING A CERAMIC PRODUCT WHICH COMPRISES MELTING A GLASS-MAKING COMPOSITION CONTAINING FROM 2-20% BY WEIGHT TIO2 AND AT LEAST 50% BY WEIGHT, EXCLUSIVE OF SAID TIO2, OF CRYSTALLIZABLE GLASSMAKING INGREDIENTS, COOLING THE MELT TO FORM A GLASS, EXPOSING THE GLASS TO A TEMPERATURE BETWEEN THE MAXIMUM NUCLEATION TEMPERATURE AND THE ANNEALING TEMPERATURE OF THE GLASS FOR A TIME OF BETWEEN 1 MINUTE AND 100 HOURS, AND FINALLY INCREASING THE TEMPERATURE OF THE GLASS TO A LEVEL AT WHICH GLASS-MAKING INGREDIENTS CRYSTALLIZE BUT BELOW THE TEMPERATURE AT WHICH THE PREDOMINANT CRYSTALLINE PHASE WILL REDISSOLVE, AND MAINTAINING SAID GLASS WITHIN SAID TEMPERATURE RANGE UNTIL A PRODUCT, AT LEAST 50% OF WHICH IS CRYSTALLINE, IS OBTAINED.
Claim 2
Independent Claim
116 words
THE METHOD OF MAKING A CERAMIC PRODUCT WHICH COMPRISES MELTING A GLASS-MAKING COMPOSITION CONTAINING FROM 2-20% BY WEIGHT TIO2 AND AT LEAST 50% BY WEIGHT, EXCLUSIVE OF SAID TIO2, OF CRYSTALLIZABLE GLASSMAKING INGREDIENTS, COOLING THE MELT TO FORM A GLASS, EXPOSING THE GLASS TO A TEMPERATURE BETWEEN THE MAXIMUM NUCLEATION TEMPERATURE AND THE ANNEALING TEMPERATURE OF THE GLASS FOR A TIME OF BETWEEN 1 MINUTE AND 100 HOURS, AND FINALLY INCREASING THE TEMPERATURE OF THE GLASS TO A LEVEL AT WHICH GLASS-MAKING INGREDIENTS CRYSTALLIZE BUT BELOW THE TEMPERATURE AT WHICH THE PREDOMINANT CRYSTALLINE PHASE WILL REDISSOLVE, AND MAINTAINING SAID GLASS WITHIN SAID TEMPERATURE RANGE UNTIL A PRODUCT, AT LEAST 50% OF WHICH IS CRYSTALLINE, IS OBTAINED.
Claim 3
Dependent Claim
62 words
A CERAMIC BODY CONSISTING ESSENTIALLY OF A MULTIPLICITY OF INTERLOCKED INORGANIC CRYSTALS DISPERSED IN A GLASSY MATRIX, SAID CRYSTALLS BEING ON THE ORDER OF 0.1-20 MICRONS IN DIAMETER AND CONSTITUTING AT LEAST 50% OF THE BODY AND FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS CONSISTING ESSENTIALLY OF INORGANIC CONSTITUENTS, SAND GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS.
Claim 4
Dependent Claim
62 words
A CERAMIC BODY CONSISTING ESSENTIALLY OF A MULTIPLICITY OF INTERLOCKED INORGANIC CRYSTALS DISPERSED IN A GLASSY MATRIX, SAID CRYSTALLS BEING ON THE ORDER OF 0.1-20 MICRONS IN DIAMETER AND CONSTITUTING AT LEAST 50% OF THE BODY AND FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS CONSISTING ESSENTIALLY OF INORGANIC CONSTITUENTS, SAND GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS.
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |