US2584975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Corning Glass Works
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Filing: 1951-03-27
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Granted: 1952-02-12
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Expires: 1971-03-27
Abstract
No abstract record available.
Inventors
- 👤 William H Armistead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
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: 2
Claim 1
Independent Claim
95 words
A TRANSPARENT THORIUM-FREE OPTICAL GLASS COMPRISING 5-40% SIO2, 5-40% B2O3, 5-35% LA2O3, AND AT LEAST TWO DIVALENT METAL OXIDES IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF 2-15% BEO, UP TO 30% MGO, 10-60% CAO, UP TO 60% ZNO, UP TO 60% SRO, UP TO 60% CDO, UP TO 60% BAO, AND UP TO 20% PBO, THE SELECTED DIVALENT METAL OXIDES BEING BETWEEN 20% AND COA IN THE ABOVE-INDICATED PROPORTIONS, THE TOTAL DIVALENT METAL OXIDES BEING BETWEEN 20% AND 75%, AND THE TOTAL DIVALENT METAL OXIDES PLUS LA2O3 BEING BETWEEN 55% AND 80%.
Claim 2
Dependent Claim
95 words
A TRANSPARENT THORIUM-FREE OPTICAL GLASS COMPRISING 5-40% SIO2, 5-40% B2O3, 5-35% LA2O3, AND AT LEAST TWO DIVALENT METAL OXIDES IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF 2-15% BEO, UP TO 30% MGO, 10-60% CAO, UP TO 60% ZNO, UP TO 60% SRO, UP TO 60% CDO, UP TO 60% BAO, AND UP TO 20% PBO, THE SELECTED DIVALENT METAL OXIDES BEING BETWEEN 20% AND COA IN THE ABOVE-INDICATED PROPORTIONS, THE TOTAL DIVALENT METAL OXIDES BEING BETWEEN 20% AND 75%, AND THE TOTAL DIVALENT METAL OXIDES PLUS LA2O3 BEING BETWEEN 55% AND 80%.
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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |