Patent US3149984A successfully refreshed from Google Patents.
US3149984A
Expired / Lapsed
US
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Lead glass for optical use
Assignee: Schott AG
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Filing: 1961-12-14
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Granted: 1964-09-22
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Expires: 1981-12-14
Abstract
No abstract record available.
Inventors
- 👤 Faulstich Marga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:44
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/142; C03C3/15; C03C3/155
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A GLASS COMPOSITION SUITABLE FOR OPTICAL PURPOSES AND HAVING EXCELLENT CHEMICAL STABILITY CONSISTING ESSENTIALLY OF, IN PERCENT BY WEIGHT OF THE GLASS, 5 TO 67% OF PBO, 12 TO 16% OF AL2O3, 10 TO 45% OF LA2O3, 15 TO 36% OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF BIO3 AND SIO2, THE REMAINDER CONSISTING OF A MEMBER OF THE GROUP OF 0-7% OF A HIGHLY REFRACTIVE OXIDE OF THE GROUP OF TETRAVALENT AND PENTAVALENT OXIDES, 0-12% OF BIVALENT OXIDES OTHER THAN PBO SELECTED FROM THE GROUP CONSISTING OF BARIUM, MAGNESIUM, CALCIUM, ZINC, AND STRONTIUM OXIDES, AND MIXTURES THEREOF, WHEREIN THE TOTAL OF THE B2O3, SIO2, TETRAVALENT, PENTAVALENT AND BIVALENT OXIDES OTHER THAN PBO OXIDES DOES NOT EXCEED 51%.
Claim 2
Dependent Claim
120 words
A GLASS COMPOSITION SUITABLE FOR OPTICAL PURPOSES AND HAVING EXCELLENT CHEMICAL STABILITY CONSISTING ESSENTIALLY OF, IN PERCENT BY WEIGHT OF THE GLASS, 5 TO 67% OF PBO, 12 TO 16% OF AL2O3, 10 TO 45% OF LA2O3, 15 TO 36% OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF BIO3 AND SIO2, THE REMAINDER CONSISTING OF A MEMBER OF THE GROUP OF 0-7% OF A HIGHLY REFRACTIVE OXIDE OF THE GROUP OF TETRAVALENT AND PENTAVALENT OXIDES, 0-12% OF BIVALENT OXIDES OTHER THAN PBO SELECTED FROM THE GROUP CONSISTING OF BARIUM, MAGNESIUM, CALCIUM, ZINC, AND STRONTIUM OXIDES, AND MIXTURES THEREOF, WHEREIN THE TOTAL OF THE B2O3, SIO2, TETRAVALENT, PENTAVALENT AND BIVALENT OXIDES OTHER THAN PBO OXIDES DOES NOT EXCEED 51%.
References Cited (Backward Citations)
US2406580A
Cited
US2477649A
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US2584975A
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US2861000A
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US2678281A
Cited
US3006776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |