Patent US3252811A successfully refreshed from Google Patents.
US3252811A
Expired / Lapsed
US
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Glass-ceramic bodies and method of making them
Assignee: Corning Glass Works
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Filing: 1963-12-11
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Granted: 1966-05-24
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Expires: 1983-12-11
Abstract
No abstract record available.
Inventors
- 👤 George H Beall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:30
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0018; C03C10/0027; C03C10/0036; C03C10/0045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A TRANSPARENT SEMICRYSTALLINE CERAMIC BODY CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE-GRATED, RANDOMLYORIENTED, INORGANIC CRYSTALS SUBSTANTIALLY UNIFORMLY DISPERSED IN A GLASSY MATRIX, SAID CRYSTALS BEING FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS BODY MADE FROM A GLASS-FORMING BATCH CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF 60-80% SIO2, 15-30% AL2O3, AND 2-20% XO, WHEREIN XO REPRESENTS THE TOTAL OF 0-15% MGO+0-4% LI2O+0-12% ZNO, AT LEAST 2% MGO BEING REQUIRED WHEN PRESENT ALONE AND AT LEAST 2% LI2O+AT LEAST 4% ZNO BEING REQUIRED WHEN MGO IS PRESENT IN AN AMOUNT LESS THAN 2%, TO WHICH IS ADDED 2-15% ZRO2, BASED UPON THE TOTAL WEIGHT OF THE BASE GLASS COMPOSITION, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS REMAINING AFTER THE CRYSTALLIZATION OF SAID CRYSTALS.
Claim 2
Dependent Claim
129 words
A TRANSPARENT SEMICRYSTALLINE CERAMIC BODY CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE-GRATED, RANDOMLYORIENTED, INORGANIC CRYSTALS SUBSTANTIALLY UNIFORMLY DISPERSED IN A GLASSY MATRIX, SAID CRYSTALS BEING FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS BODY MADE FROM A GLASS-FORMING BATCH CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF 60-80% SIO2, 15-30% AL2O3, AND 2-20% XO, WHEREIN XO REPRESENTS THE TOTAL OF 0-15% MGO+0-4% LI2O+0-12% ZNO, AT LEAST 2% MGO BEING REQUIRED WHEN PRESENT ALONE AND AT LEAST 2% LI2O+AT LEAST 4% ZNO BEING REQUIRED WHEN MGO IS PRESENT IN AN AMOUNT LESS THAN 2%, TO WHICH IS ADDED 2-15% ZRO2, BASED UPON THE TOTAL WEIGHT OF THE BASE GLASS COMPOSITION, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS REMAINING AFTER THE CRYSTALLIZATION OF SAID CRYSTALS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |