US2688561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye-protective ophthalmic glass
Assignee: Corning Glass Works
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Filing: 1953-04-27
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Granted: 1954-09-07
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 William H Armistead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:57
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C1/00; C03C1/10; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A REDUCED, SUBSTANTIALLY NEUTRAL-COLORED, INFRARED-ABSORBING AND ULTRAVIOLET-ABSORBING GLASS HAVING A REFRACTIVE INDEX (ND) OF ABDOUT 1.523$0.001, AN EXPANSION COEFFICIENT OF ABOUT 92 TO 98X10-7 PER *C. AND A SOFTENING POINT BETWEEN ABOUT 710* AND 735* C., AND COMPRISING ESSENTIALLY 63 TO 70% SIO2, 8 TO 19% K2O, AT LEAST ONE ALKALI METAL OXIDE IN THE INDICATED PROPORTION SELECTED FROM THE GROUP CONSISTING OF UP TO 10% NA2O AND UP TO 4% LI2O, THE PERCENTAGE OF NA2O BEING AT LEAST 4% WHEN ONLY K2O AND NA2O ARE PRESENT AND THE PERCENTAGE OF LI2O BEING AT LEAST 1% WHEN ONLY K2O AND LI2O ARE PRESENT THE SELECTED ALKALI METAL OXIDE COMPRISING LI2O WHEN THE PERCENTAGE OF K2O IS BETWEEN 16 AND 19%, THE TOTAL ALKALI METAL OXIDES BEING 15 TO 22%, AND 5 TO 17% ZNO, AND CONTAINING GLASS-COLORING COMPONENTS CONSISTING OF FEO AND FE2O3 TOTALLING 0.3 TO 4.5% COMPUTED AS FE2O3, 0.1 TO 2% TIO2, AND 0.02 TO 0.50% NIO, THE RATIO OF THE COMPUTED FE2O3/NIO BEING FROM 5/1 TO 15/1, THE ESSENTIAL CONSTITUENTS TOTALLING AT LEAST 90%.
Claim 2
Dependent Claim
177 words
A REDUCED, SUBSTANTIALLY NEUTRAL-COLORED, INFRARED-ABSORBING AND ULTRAVIOLET-ABSORBING GLASS HAVING A REFRACTIVE INDEX (ND) OF ABDOUT 1.523$0.001, AN EXPANSION COEFFICIENT OF ABOUT 92 TO 98X10-7 PER *C. AND A SOFTENING POINT BETWEEN ABOUT 710* AND 735* C., AND COMPRISING ESSENTIALLY 63 TO 70% SIO2, 8 TO 19% K2O, AT LEAST ONE ALKALI METAL OXIDE IN THE INDICATED PROPORTION SELECTED FROM THE GROUP CONSISTING OF UP TO 10% NA2O AND UP TO 4% LI2O, THE PERCENTAGE OF NA2O BEING AT LEAST 4% WHEN ONLY K2O AND NA2O ARE PRESENT AND THE PERCENTAGE OF LI2O BEING AT LEAST 1% WHEN ONLY K2O AND LI2O ARE PRESENT THE SELECTED ALKALI METAL OXIDE COMPRISING LI2O WHEN THE PERCENTAGE OF K2O IS BETWEEN 16 AND 19%, THE TOTAL ALKALI METAL OXIDES BEING 15 TO 22%, AND 5 TO 17% ZNO, AND CONTAINING GLASS-COLORING COMPONENTS CONSISTING OF FEO AND FE2O3 TOTALLING 0.3 TO 4.5% COMPUTED AS FE2O3, 0.1 TO 2% TIO2, AND 0.02 TO 0.50% NIO, THE RATIO OF THE COMPUTED FE2O3/NIO BEING FROM 5/1 TO 15/1, THE ESSENTIAL CONSTITUENTS TOTALLING AT LEAST 90%.
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) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |