Patent US3294558A successfully refreshed from Google Patents.
US3294558A
Expired / Lapsed
US
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Colorless high index glass compositions
Assignee: Cataphote Inc
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Filing: 1963-04-22
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Granted: 1966-12-27
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Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 Charles E Searight
- 👤 Ezra M Alexander
- 👤 John R Ryan
- 👤 Labino Dominick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:25
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A HIGH REFRACTIVE INDEX GLASS COMPOSITION CONSISTING ESSENTIALLY OF FROM ABOUT 10% TO ABOUT 50% BY WEIGHT OF TITANIUM DIOXIDE, FROM ABOUT 10% TO ABOUT 65% BY WEIGHT OF RO TYPE OXIDES SELECTED FROM THE GROUP CONSISTING OF BARIUM OXIDE AND ZINC OXIDE, AT LEAST 10% BY WEIGHT BEING BARIUM OXIDE, FROM ABOUT 6% TO ABOUT 40% BY WEIGHT OF CALCIUM OXIDE, AND FROM ABOUT 0.2% TO ABOUT 30% BY WEIGHT OF SILICON DIOXIDE.
Claim 2
Dependent Claim
74 words
A HIGH REFRACTIVE INDEX GLASS COMPOSITION CONSISTING ESSENTIALLY OF FROM ABOUT 10% TO ABOUT 50% BY WEIGHT OF TITANIUM DIOXIDE, FROM ABOUT 10% TO ABOUT 65% BY WEIGHT OF RO TYPE OXIDES SELECTED FROM THE GROUP CONSISTING OF BARIUM OXIDE AND ZINC OXIDE, AT LEAST 10% BY WEIGHT BEING BARIUM OXIDE, FROM ABOUT 6% TO ABOUT 40% BY WEIGHT OF CALCIUM OXIDE, AND FROM ABOUT 0.2% TO ABOUT 30% BY WEIGHT OF SILICON DIOXIDE.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |