US2657146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borosilicate optical glass
Assignee: Bausch and Lomb Inc
•
Filing: 1951-09-29
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Granted: 1953-10-27
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Expires: 1971-09-29
Abstract
No abstract record available.
Inventors
- 👤 Norbert J Kreidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:31
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/095; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A BOROSILICATE OPTICAL GLASS WHIHC IS STABILIZED AGAINST DISCOLORATION BY IRRADIATION AND COMPRISES BY WEIGHT 60-70% OF SIO2, 10-20% OF B2O3, 1-5% OF ZNO, 10-15% OF NA2O, 0.2-2% OF CEO2, AND NOT OVER 2% EACH OF SRO AND AL2O3.
Claim 2
Dependent Claim
39 words
A BOROSILICATE OPTICAL GLASS WHIHC IS STABILIZED AGAINST DISCOLORATION BY IRRADIATION AND COMPRISES BY WEIGHT 60-70% OF SIO2, 10-20% OF B2O3, 1-5% OF ZNO, 10-15% OF NA2O, 0.2-2% OF CEO2, AND NOT OVER 2% EACH OF SRO AND AL2O3.
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |