US2644361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection plotting lens and optical system
Assignee: United States Department of the Navy
•
Filing: 1946-09-30
•
Granted: 1953-07-07
•
Expires: 1966-09-30
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Birdsall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:50
CPC Classifications
G; G02; G02B; G02B3/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1837979A
Cited
US1349336A
Cited
US1692973A
Cited
US1589797A
Cited
US1705951A
Cited
GB250268A
Cited
US1771844A
Cited
US1953299A
Cited
US1989295A
Cited
US2066996A
Cited
US2291152A
Cited
US2372494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |