Patent US2518028A successfully refreshed from Google Patents.
US2518028A
Expired / Lapsed
US
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Optical glass
Assignee: Bausch and Lomb Inc
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Filing: 1947-06-23
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Granted: 1950-08-08
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Expires: 1967-06-23
Abstract
No abstract record available.
Inventors
- 👤 Norbert J Kreidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:33
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
AN OPTICAL GLASS COMPOSITION HAVING APPROXIMATELY FROM 26.6 TO 30 MOLAR PERCENT OF SILICA; 28.9 TO 30 MOLAR PERCENT OF BORIC OXIDE; 26.6 TO 30 MOLAR PERCENT OF BARIUM OXIDE; 7.2 MOLAR PERCENT OF LANTHANUM OXIDE; AN OXIDE AND COLUMBIUM OXIDE AND IN WHICH THE TANTALUM OXIDE MAY HAVE A RANGE OF 2.2 TO 3.5 MOLAR PERCENT AND THE COLUMBIUM OXIDE IS PRESENT IN 3.5 MOLAR PERCENT; AND APPROXIMATELY 1.9 MOLAR PERCENT EACH OF ALUMINA AND ZIRCONIA.
Claim 2
Dependent Claim
77 words
AN OPTICAL GLASS COMPOSITION HAVING APPROXIMATELY FROM 26.6 TO 30 MOLAR PERCENT OF SILICA; 28.9 TO 30 MOLAR PERCENT OF BORIC OXIDE; 26.6 TO 30 MOLAR PERCENT OF BARIUM OXIDE; 7.2 MOLAR PERCENT OF LANTHANUM OXIDE; AN OXIDE AND COLUMBIUM OXIDE AND IN WHICH THE TANTALUM OXIDE MAY HAVE A RANGE OF 2.2 TO 3.5 MOLAR PERCENT AND THE COLUMBIUM OXIDE IS PRESENT IN 3.5 MOLAR PERCENT; AND APPROXIMATELY 1.9 MOLAR PERCENT EACH OF ALUMINA AND ZIRCONIA.
References Cited (Backward Citations)
US2434149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |