Patent US2580507A successfully refreshed from Google Patents.
US2580507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens blocking device
Assignee: American Optical Corp
•
Filing: 1948-01-12
•
Granted: 1952-01-01
•
Expires: 1968-01-12
Abstract
No abstract record available.
Inventors
- 👤 Daniel P Bernheim
- 👤 Carl G Silverberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:48
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USRE18569E
Cited
US1168710A
Cited
US1261766A
Cited
US1332778A
Cited
US1456673A
Cited
US1609937A
Cited
US1906050A
Cited
US2031380A
Cited
US2151233A
Cited
US2253954A
Cited
US2335222A
Cited
US2397743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |