US3148994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-ceramic bodies and method of making
Assignee: Corning Glass Works
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Filing: 1962-06-20
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Granted: 1964-09-15
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Expires: 1982-06-20
Abstract
No abstract record available.
Inventors
- 👤 Raymond O Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:45
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A METHOD OF MANUFACTURING A HIGH STRENGTH, SEMICRYSTALLINE CERAMIC BODY COMPRISING THE STEPS OF MELTING A BATCH FOR A GLASS COMPOSITION WHICH, BY ANALYSIS, CONSISTS ESSENTIALLY, BY WEIGHT, OF 65-75% SIO2, 1-4% LI2O, 1-4% MGO, 15-25% AL2O3, 0.5-2.0% ZNO, 3-6% TIO2, 0.1-2.0% TOTAL OF AT LEAST ONE ALKALI METAL OXIDE OF THE GROUP CONSISTING OF NA2O, AND K2O, AND 0.1-1.2%F. SIMULTANEOUSLY COOLING THE MELT BELOW THE TRANSFORMATION POINT OF THE MELT AND SHAPING A GLASS BODY THEREFROM, THEREAFTER EXPOSING SAID GLASS BODY TO A TEMPERATURE OF AT LEAST ABOUT 750*C., BUT NOT OVER ABOUT 1200*C., FOR A TIME SUFFICIENT TO ATTAIN THE DESIRED CRYSTALLIZATION, AND THEN COOLING SAID SHAPE TO ROOM TEMPERATURE.
Claim 2
Independent Claim
112 words
A METHOD OF MANUFACTURING A HIGH STRENGTH, SEMICRYSTALLINE CERAMIC BODY COMPRISING THE STEPS OF MELTING A BATCH FOR A GLASS COMPOSITION WHICH, BY ANALYSIS, CONSISTS ESSENTIALLY, BY WEIGHT, OF 65-75% SIO2, 1-4% LI2O, 1-4% MGO, 15-25% AL2O3, 0.5-2.0% ZNO, 3-6% TIO2, 0.1-2.0% TOTAL OF AT LEAST ONE ALKALI METAL OXIDE OF THE GROUP CONSISTING OF NA2O, AND K2O, AND 0.1-1.2%F. SIMULTANEOUSLY COOLING THE MELT BELOW THE TRANSFORMATION POINT OF THE MELT AND SHAPING A GLASS BODY THEREFROM, THEREAFTER EXPOSING SAID GLASS BODY TO A TEMPERATURE OF AT LEAST ABOUT 750*C., BUT NOT OVER ABOUT 1200*C., FOR A TIME SUFFICIENT TO ATTAIN THE DESIRED CRYSTALLIZATION, AND THEN COOLING SAID SHAPE TO ROOM TEMPERATURE.
Claim 3
Dependent Claim
82 words
A SEMICRYSTALLINE CERAMIC BODY CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE-GRAINED, INORGANIC CRYSTALS DISPERSED IN A GLASSY MATRIX, SAID CRYSTALS BEING FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS CONSISTING ESSENTIALLY, BY WEIGHT, OF 65-75% SIO2, 1-4%LI2O, 1-4% MGO, 15-25% AL2O3, 0.5-2.0% ZNO, 3-6% TIO2, 0.12.0% TOTAL OF AT LEAST ONE ALKALI METAL OXIDE OF THE GROUP CONSISTING OF NA2O AND K2O, AND 0.1-1.2%F, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS REMAINING AFTER CRYSTALLIZATION OF SAID CRYSTALS.
Claim 4
Dependent Claim
82 words
A SEMICRYSTALLINE CERAMIC BODY CONSISTING ESSENTIALLY OF A MULTIPLICITY OF FINE-GRAINED, INORGANIC CRYSTALS DISPERSED IN A GLASSY MATRIX, SAID CRYSTALS BEING FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS CONSISTING ESSENTIALLY, BY WEIGHT, OF 65-75% SIO2, 1-4%LI2O, 1-4% MGO, 15-25% AL2O3, 0.5-2.0% ZNO, 3-6% TIO2, 0.12.0% TOTAL OF AT LEAST ONE ALKALI METAL OXIDE OF THE GROUP CONSISTING OF NA2O AND K2O, AND 0.1-1.2%F, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS REMAINING AFTER CRYSTALLIZATION OF SAID CRYSTALS.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |