US2523362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barium crown optical glass
Assignee: Bausch and Lomb Inc
•
Filing: 1946-03-21
•
Granted: 1950-09-26
•
Expires: 1966-03-21
Abstract
No abstract record available.
Inventors
- 👤 Walter A Fraser
- 👤 Norbert J Kreidl
- 👤 Lee O Upton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A BATCH FOR BARIUM CROWN OPTICAL GLASS HAVING A REFRACTIVE INDEX OF ABOUT 1.66 AND A RECIPROCAL RELATIVE DISPERSION OF ABOUT 50, SAID BATCH COMPRISING ABOUT 42% BARIUM OXIDE, ABOUT 33% SILICA, ABOUT 4% POTASSIUM OXIDE, ABOUT 6% CADMIUM OXIDE, ABOUT 7% ZIRCONIUM OXIDE, AND ABOUT 3% OF LANTHANUM OXIDE.
Claim 2
Dependent Claim
50 words
A BATCH FOR BARIUM CROWN OPTICAL GLASS HAVING A REFRACTIVE INDEX OF ABOUT 1.66 AND A RECIPROCAL RELATIVE DISPERSION OF ABOUT 50, SAID BATCH COMPRISING ABOUT 42% BARIUM OXIDE, ABOUT 33% SILICA, ABOUT 4% POTASSIUM OXIDE, ABOUT 6% CADMIUM OXIDE, ABOUT 7% ZIRCONIUM OXIDE, AND ABOUT 3% OF LANTHANUM OXIDE.
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) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |