US3477863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy flint glasses
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1964-09-18
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Granted: 1969-11-11
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Expires: 1984-09-18
Abstract
No abstract record available.
Inventors
- 👤 Heinz Bromer
- 👤 Norbert Meinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:35
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/066; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/903
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
144 words
THE GLASS CONSISTS ESSENTIALLY OF IN PARTS BY WEIGHT FROM ABOUT 12% TO ABOUT 20% SILICON DIOXIDE, FROM ABOUT 8% TO ABOUT 20% BORON OXIDE, THE COMBINED TOTAL OF SILICON DIOXIDE AND BORON OXIDE BEING FROM ABOUT 26% TO ABOUT 33%, FROM ABOUT 5% TO ABOUT 20% ZINC OXIDE, UP TO ABOUT 7.5% CADMIUM OXIDE, THE TOTAL OF ZINC OXIDE AND CADMIUM OXIDE BEING FROM ABOUT 6.5% TO ABOUT 20% FROM ABOUT 10% TO ABOUT 24% BARIUM OXIDE, UP TO ABOUT 5% MAGNESIUM OXIDE, UP TO ABOUT 10% STRONTIUM OXIDE, UP TO ABOUT 25% CALCIUM OXIDE, THE TOTAL OF THE OXIDES OF BARIUM, MAGNESIUM, CALCIUM AND STRONTIUM BEING FROM ABOUT 14% TO ABOUT 46%, FROM ABOUT 4.0% TO ABOUT 7.5% ZIRCONIUM OXIDE, AND FROM ABOUT 6.5% TO ABOUT 25% TITANIUM DIOXIDE, UP TO ABOUT 20% LANTHANUM OXIDE, AND UP TO ABOUT 5% ALKALI OXIDES.
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) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |