Patent US3212064A successfully refreshed from Google Patents.
US2300251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable focus lens
Assignee: Bausch and Lomb Inc
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Filing: 1941-01-23
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Granted: 1942-10-27
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Expires: 1961-01-23
Abstract
No abstract record available.
Inventors
- 👤 Edward F Flint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/12; G02B3/14
Claims Analysis
Total Claims: 0
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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) | 1945-10-26 | 1946-04-27 | 1946-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-26 | 1950-04-27 | 1950-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-26 | 1954-04-27 | 1954-10-27 | $7700.00 | Window Closed / Lapsed |