US2776217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Deutsche Spiegelglas AG
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Filing: 1953-08-21
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Granted: 1957-01-01
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Expires: 1973-08-21
Abstract
No abstract record available.
Inventors
- 👤 Gott Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/226; C; C03; C03C; C03C14/00; C03C14/006; C03C4/00; C03C4/02; C03C4/08; C03C4/082; G02B5/208; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
AN OPHTHAIMIC GLASS CONSISTING ESSENTIALLY OF SIO2, NA2O, CAO AND K2O IN ADDITION TO THE FOLLOWING COMPONENTS IN THE PROPORTIONS BY WEIGHT SPECIFIED FERROUS OXIDE (FEO) 0.11 TO 0.20%, FERRIC OXIDE (FE2O3) 0.01 TO 0.02%, SELENIUM (SE) 0.001 TO 0.03% AND 0.11 TO 0.40% OF AN OXIDE SELECTED FROM THE GROUP OF OXIDES CONSISTING OF TITANIUM DIOXIDE (TIO2) AND TUNGSTIC OXIDE (WO3).
Claim 2
Dependent Claim
62 words
AN OPHTHAIMIC GLASS CONSISTING ESSENTIALLY OF SIO2, NA2O, CAO AND K2O IN ADDITION TO THE FOLLOWING COMPONENTS IN THE PROPORTIONS BY WEIGHT SPECIFIED FERROUS OXIDE (FEO) 0.11 TO 0.20%, FERRIC OXIDE (FE2O3) 0.01 TO 0.02%, SELENIUM (SE) 0.001 TO 0.03% AND 0.11 TO 0.40% OF AN OXIDE SELECTED FROM THE GROUP OF OXIDES CONSISTING OF TITANIUM DIOXIDE (TIO2) AND TUNGSTIC OXIDE (WO3).
References Cited (Backward Citations)
US1830902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |