US2517459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Corning Glass Works
•
Filing: 1946-05-27
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Granted: 1950-08-01
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Expires: 1966-05-27
Abstract
No abstract record available.
Inventors
- 👤 William H Armistead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:29
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A SUBSTANTIALLY COLORLESS OPTICAL GLASS CONSISTING OF INGREDIENTS COMPATIBLE IN GLASS AND COMPRISING 10% TO 20% SIO2 10% TO 20% B2O3, 5%, BEO, 20% CAO, UP TO 5% ZRO2, 5% TO 35% BAO, AND 5% TO 35% OF CDO, THE TOTAL OF THE PERCENTAGES OF BAO AND CDO BEING BETWEEN 30% AND 45%, THE REFRACTIVE INDEX (ND) BEING AT LEAST 1.67 AND THE DISPERSIVE INDEX (V) BEING GREATER THAN V=229ND.
Claim 2
Dependent Claim
70 words
A SUBSTANTIALLY COLORLESS OPTICAL GLASS CONSISTING OF INGREDIENTS COMPATIBLE IN GLASS AND COMPRISING 10% TO 20% SIO2 10% TO 20% B2O3, 5%, BEO, 20% CAO, UP TO 5% ZRO2, 5% TO 35% BAO, AND 5% TO 35% OF CDO, THE TOTAL OF THE PERCENTAGES OF BAO AND CDO BEING BETWEEN 30% AND 45%, THE REFRACTIVE INDEX (ND) BEING AT LEAST 1.67 AND THE DISPERSIVE INDEX (V) BEING GREATER THAN V=229ND.
Claim 3
Dependent Claim
96 words
A SUBSTANTIALLY COLORLESS TITANIUM-FREE OPTICAL GLASS CONSISTING OF INGREDIENTS COMPATIBLE IN GLASS COMPRISING 5% TO 40% SIO2, 5% TO 40% B2O3 AND AT LEAST TWO DIVALENT METAL OXIDES IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF 2% TO 15% BEO, UP TO 30% MGO, 10% TO 60% CAO, UP TO 60% ZNO, 10% TO 60% SRO, 10% TO 60% OF A MIXLTURE OF CAO AND SRO, UP TO 60% CDO, UP TO 60% BAO, AND UP TO 20% PBO, THE SELECTED DIVALENT METAL OXIDES INCLUDING BEO AND AN OXIDE SELECTED FROM THE GROUP CON-
Claim 4
Dependent Claim
96 words
A SUBSTANTIALLY COLORLESS TITANIUM-FREE OPTICAL GLASS CONSISTING OF INGREDIENTS COMPATIBLE IN GLASS COMPRISING 5% TO 40% SIO2, 5% TO 40% B2O3 AND AT LEAST TWO DIVALENT METAL OXIDES IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF 2% TO 15% BEO, UP TO 30% MGO, 10% TO 60% CAO, UP TO 60% ZNO, 10% TO 60% SRO, 10% TO 60% OF A MIXLTURE OF CAO AND SRO, UP TO 60% CDO, UP TO 60% BAO, AND UP TO 20% PBO, THE SELECTED DIVALENT METAL OXIDES INCLUDING BEO AND AN OXIDE SELECTED FROM THE GROUP CON-
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) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |