Patent US2678281A successfully refreshed from Google Patents.
US2678281A
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Optical glass
Assignee: Schott AG
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Filing: 1953-05-06
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Granted: 1954-05-11
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Expires: 1973-05-06
Abstract
No abstract record available.
Inventors
- 👤 Geffcken Walter
- 👤 Rehs Gerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:16
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/12; C03C3/14; C03C3/15; C03C3/155; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
OPTICAL GLASS OF A REFRACTIVE INDEX ND GREATER THAN 1.70 AND A V-VALUE BETWEEN 42 AND 52 BEING FREE FROM TANTALUM IXIDE, THORIUM OXIDE AND BERYLLIUM OXIDE AND CONTAINING FROM 25% TO 38% LA2O3, 4% TO 18% PBO, 30% TO 48% B2O3, AT THE MOST 6% SIO2, AND 9% TO 30% OF CAO PLUS SRO PLUS BAO PLUS ZNO.
Claim 2
Dependent Claim
59 words
OPTICAL GLASS OF A REFRACTIVE INDEX ND GREATER THAN 1.70 AND A V-VALUE BETWEEN 42 AND 52 BEING FREE FROM TANTALUM IXIDE, THORIUM OXIDE AND BERYLLIUM OXIDE AND CONTAINING FROM 25% TO 38% LA2O3, 4% TO 18% PBO, 30% TO 48% B2O3, AT THE MOST 6% SIO2, AND 9% TO 30% OF CAO PLUS SRO PLUS BAO PLUS ZNO.
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) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |