Patent US2967779A successfully refreshed from Google Patents.
US2967779A
Expired / Lapsed
US
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Optical glass
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1958-03-24
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Granted: 1961-01-10
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Expires: 1978-03-24
Abstract
No abstract record available.
Inventors
- 👤 Izumitani Tetsuro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:51
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
AN OPTICAL GLASS COMPOSITION CONSISTING OF 18 TO 23 PERCENT BY WEIGHT OF BORIC OXIDE, 28 TO 45 PERCENT BY WEIGHT OF CADMIUM OXIDE, 20 TO 34 PERCENT BY WEIGHT OF LANTHANUM OXIDE, THE TOTAL WEIGHT OF BORIC OXIDE, CADMIUM OXIDE AND LANTHANUM OXIDE BEING LESS THAN 90% BY WEIGHT OF THE TOTAL WEIGHT OF THE COMPOSITION, AND FURTHER CONSISTING OF 0 TO 7 PERCENT BY WEIGHT OF TANTALUM OXIDE, 3 TO 5 PERCENT BY WEIGHT OF SILICON DIOXIDE, 2 TO 7 PERCENT BY WEIGHT ZIRCONIUM OXIDE AND 2 TO PERCENT BY WEIGHT OF TITANIUM OXIDE.
Claim 2
Dependent Claim
96 words
AN OPTICAL GLASS COMPOSITION CONSISTING OF 18 TO 23 PERCENT BY WEIGHT OF BORIC OXIDE, 28 TO 45 PERCENT BY WEIGHT OF CADMIUM OXIDE, 20 TO 34 PERCENT BY WEIGHT OF LANTHANUM OXIDE, THE TOTAL WEIGHT OF BORIC OXIDE, CADMIUM OXIDE AND LANTHANUM OXIDE BEING LESS THAN 90% BY WEIGHT OF THE TOTAL WEIGHT OF THE COMPOSITION, AND FURTHER CONSISTING OF 0 TO 7 PERCENT BY WEIGHT OF TANTALUM OXIDE, 3 TO 5 PERCENT BY WEIGHT OF SILICON DIOXIDE, 2 TO 7 PERCENT BY WEIGHT ZIRCONIUM OXIDE AND 2 TO PERCENT BY WEIGHT OF TITANIUM OXIDE.
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) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |