Patent DE2315056A1 successfully refreshed from Google Patents.
US2732763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Varifocal lens constructions and devices
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
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Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:40
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235364A
Cited
US2165341A
Cited
GB536706A
Cited
US2454686A
Cited
US2514239A
Cited
US2566485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |