US3279931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-ceramic body and method of making it
Assignee: Corning Glass Works
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Filing: 1963-02-13
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Granted: 1966-10-18
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Expires: 1983-02-13
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Olcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:12
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/203; C03B23/02; C03B23/023; C03B23/0235; C03B32/00; C03B32/02; C03C; C03C10/00; C03C10/0018; C03C10/0027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A SEMICRYSTALLINE CERAMIC BODY EXHIBITING GOOD STABILITY AT ELEVATED TEMPERATURES AND HAVING A LINEAR COEFFICIENT OF THERMAL EXPANSION BETWEEN 25*C.-300*C. OF +3X10-7/*C. AND A LINEAR COEFFIENT OF THERMAL EXPANSION BETWEEN 25*-650*C. OF $5X10-7/*C. CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE-GRAINED CRYSTALS DISPERSED IN A GLASSY MATRIX, SAID CRYSTALS BEING FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS BODY FORMED FROM A BATH CONSISTING ESSENTIALLY, BY WEIGHT, OF 43-52% SIO2, 35-43% AL2O3, 8-11% LI2O, AND 2-6% TIO2, THE TOTAL OF SAID SIO2, AL2O3, LI2O, AND TIO2 COMPRISING AT LEAST ABOUT 90% OF SAID BATCH, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS REMAINING AFTER CRYSTALLIZATION OF SAID CRYSTALS.
Claim 2
Dependent Claim
111 words
A SEMICRYSTALLINE CERAMIC BODY EXHIBITING GOOD STABILITY AT ELEVATED TEMPERATURES AND HAVING A LINEAR COEFFICIENT OF THERMAL EXPANSION BETWEEN 25*C.-300*C. OF +3X10-7/*C. AND A LINEAR COEFFIENT OF THERMAL EXPANSION BETWEEN 25*-650*C. OF $5X10-7/*C. CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE-GRAINED CRYSTALS DISPERSED IN A GLASSY MATRIX, SAID CRYSTALS BEING FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS BODY FORMED FROM A BATH CONSISTING ESSENTIALLY, BY WEIGHT, OF 43-52% SIO2, 35-43% AL2O3, 8-11% LI2O, AND 2-6% TIO2, THE TOTAL OF SAID SIO2, AL2O3, LI2O, AND TIO2 COMPRISING AT LEAST ABOUT 90% OF SAID BATCH, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS REMAINING AFTER CRYSTALLIZATION OF SAID CRYSTALS.
References Cited (Backward Citations)
GB940706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |