Patent US2998675A successfully refreshed from Google Patents.
US2998675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass body having a semicrystalline surface layer and method of making it
Assignee: Corning Glass Works
•
Filing: 1959-07-01
•
Granted: 1961-09-05
•
Expires: 1979-07-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Olcott
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0018; C03C10/0027; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
THE METHOD OF MAKING A GLASS BODY WITH A HIGH MODULUS OF RUPTURE HAVING ON ITS SURFACE A THIN, COMPRESSIVE, SEMI-CRYSTALLINE LAYER OF THE SAME OXIDE COMPOSITION AS THE GLASS, WHICH COMPRISES HEAT TREATING A GLASS BODY COMPRISING BY WEIGHT 65-72 PARTS OF SIO2, NOT LESS THAN 4 PARTS OF LI2O, 22.5-30 PARTS OF AL2O3, THE WEIGHT RATIO LI2O/AL2O3 BEING NOT MORE THAN ABOUT 0.3/1, THE TOTAL SIO2, LI2O AND AL2O3 BEING AT LEAST 100 PARTS BY WEIGHT, AND AT LEAST ONE CRYSTALLIZATION CATALYST IN THE INDICATED AMOUNT SELECTED FROM THE CLASS CONSISTING OF 0.1-3.5 PARTS OF TIO2, 0.1-5 PARTS OF B2O3, 0.4-2 PARTS OF NA2O AND 0.5-10 PARTS OF PBO, THE TOTAL SIO2, LI2O, AL2O3 AND CRYSTALLIZATION CATALYST BEING NOT MORE THAN 110 PARTS BY WEIGHT BY HEATING IT AT A TEMPERATURE AT WHICH ITS VISCOSITY IS BETWEEN 10**7 AND 10**10 POISES FOR A TIME RANGING FROM ABOUT 1 HOUR TO ABOUT 40 HOURS RESPECTIVELY UNTIL MICROSCOPIC AND SUBMICROSCOPIC CRYSTALS OF BETA-EUCRYPTITE ARE FORMED WITHIN ITS SURFACE.
Claim 2
Independent Claim
168 words
THE METHOD OF MAKING A GLASS BODY WITH A HIGH MODULUS OF RUPTURE HAVING ON ITS SURFACE A THIN, COMPRESSIVE, SEMI-CRYSTALLINE LAYER OF THE SAME OXIDE COMPOSITION AS THE GLASS, WHICH COMPRISES HEAT TREATING A GLASS BODY COMPRISING BY WEIGHT 65-72 PARTS OF SIO2, NOT LESS THAN 4 PARTS OF LI2O, 22.5-30 PARTS OF AL2O3, THE WEIGHT RATIO LI2O/AL2O3 BEING NOT MORE THAN ABOUT 0.3/1, THE TOTAL SIO2, LI2O AND AL2O3 BEING AT LEAST 100 PARTS BY WEIGHT, AND AT LEAST ONE CRYSTALLIZATION CATALYST IN THE INDICATED AMOUNT SELECTED FROM THE CLASS CONSISTING OF 0.1-3.5 PARTS OF TIO2, 0.1-5 PARTS OF B2O3, 0.4-2 PARTS OF NA2O AND 0.5-10 PARTS OF PBO, THE TOTAL SIO2, LI2O, AL2O3 AND CRYSTALLIZATION CATALYST BEING NOT MORE THAN 110 PARTS BY WEIGHT BY HEATING IT AT A TEMPERATURE AT WHICH ITS VISCOSITY IS BETWEEN 10**7 AND 10**10 POISES FOR A TIME RANGING FROM ABOUT 1 HOUR TO ABOUT 40 HOURS RESPECTIVELY UNTIL MICROSCOPIC AND SUBMICROSCOPIC CRYSTALS OF BETA-EUCRYPTITE ARE FORMED WITHIN ITS SURFACE.
Claim 3
Dependent Claim
139 words
AN ARTICLE COMPRISING A GLASS BODY HAVING IN ITS ENTIRE SURFACE A THIN, COMPRESSIVE, SEMICRYSTALLINE LAYER CONTAINING A MULTIPLICITY OF MICROSCOPIC CRYSTALS OF BETAEUCRYPTITE AND HAVING A LINEAR THERMAL EXPANSION COEFFICIENT SUBSTANTIALLY LOWER THAN THAT OF THE GLASS BODY, THE OXIDE COMPOSITION OF THE ARTICLE BEING SUBSTANTIALLY THE SAME THROUGHOUT AND COMPRISING 65-72 PARTS OF SIO2, NOT LESS THAN 4 PARTS OF LI2O, 22.5-30 PARTS OF AL2O3, THE WEIGHT RATIO LI2O/AL2O3 BEING NOT MORE THAN ABOUT 0.3/1, THE TOTAL SIO2, LI2O AND AL2O3 BEING AT LEAST 100 PARTS BY WEIGHT, AND AT LEAST ONE CRYSTALLIZATION CATALYST IN THE INDICATED AMOUNT SELECTED FROM THE CLASS CONSISTING OF 0.1-3.5 PARTS OF TIO2, 0.1-5 PARTS OF B2O3, 0.4-2 PARTS OF NA2O AND 0.5-10 PARTS OF PBO, THE TOTAL SIO2, LI2O, AL2O3, AND CRYSTALLIZATION CATALYST BEING NOT MORE THAN 110 PARTS BY WEIGHT.
Claim 4
Dependent Claim
139 words
AN ARTICLE COMPRISING A GLASS BODY HAVING IN ITS ENTIRE SURFACE A THIN, COMPRESSIVE, SEMICRYSTALLINE LAYER CONTAINING A MULTIPLICITY OF MICROSCOPIC CRYSTALS OF BETAEUCRYPTITE AND HAVING A LINEAR THERMAL EXPANSION COEFFICIENT SUBSTANTIALLY LOWER THAN THAT OF THE GLASS BODY, THE OXIDE COMPOSITION OF THE ARTICLE BEING SUBSTANTIALLY THE SAME THROUGHOUT AND COMPRISING 65-72 PARTS OF SIO2, NOT LESS THAN 4 PARTS OF LI2O, 22.5-30 PARTS OF AL2O3, THE WEIGHT RATIO LI2O/AL2O3 BEING NOT MORE THAN ABOUT 0.3/1, THE TOTAL SIO2, LI2O AND AL2O3 BEING AT LEAST 100 PARTS BY WEIGHT, AND AT LEAST ONE CRYSTALLIZATION CATALYST IN THE INDICATED AMOUNT SELECTED FROM THE CLASS CONSISTING OF 0.1-3.5 PARTS OF TIO2, 0.1-5 PARTS OF B2O3, 0.4-2 PARTS OF NA2O AND 0.5-10 PARTS OF PBO, THE TOTAL SIO2, LI2O, AL2O3, AND CRYSTALLIZATION CATALYST BEING NOT MORE THAN 110 PARTS BY WEIGHT.
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) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |