US2762713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flint glasses for multifocal lenses
Assignee: Bausch and Lomb Inc
•
Filing: 1953-12-03
•
Granted: 1956-09-11
•
Expires: 1973-12-03
Abstract
No abstract record available.
Inventors
- 👤 Earl K Davis
- 👤 Murray R Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:20
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/076; C03C3/102; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
AN OPTICAL GLASS COMPOSITION COMPRISING BY WEIGHT 33% TO 44% OF SIO2, AT LEAST ONE ALKALI METAL OXIDE FROM THE GROUP CONSISTING OF K2O AND NA2O, THE TOTAL ALKALI METAL OXIDE BEING BETWEEN 4.5% AND 10.5%, 37% TO 51% PBO, 0.5% TO 6.0% BAO, AND 0.5% TO 5.0% ZNO, THE REMAINDER OF THE COMPOSITION COMPRISING COMPATIBLE OXIDES.
Claim 2
Dependent Claim
57 words
AN OPTICAL GLASS COMPOSITION COMPRISING BY WEIGHT 33% TO 44% OF SIO2, AT LEAST ONE ALKALI METAL OXIDE FROM THE GROUP CONSISTING OF K2O AND NA2O, THE TOTAL ALKALI METAL OXIDE BEING BETWEEN 4.5% AND 10.5%, 37% TO 51% PBO, 0.5% TO 6.0% BAO, AND 0.5% TO 5.0% ZNO, THE REMAINDER OF THE COMPOSITION COMPRISING COMPATIBLE OXIDES.
References Cited (Backward Citations)
US1943051A
Cited
GB408993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |