US2643339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflector scanning antenna
Assignee: United States Department of the Navy
•
Filing: 1945-09-14
•
Granted: 1953-06-23
•
Expires: 1965-09-14
Abstract
No abstract record available.
Inventors
- 👤 Chu Lan Jen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:16
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17; H01Q3/00; H01Q3/12; H01Q3/16; H01Q3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1299397A
Cited
FR804966A
Cited
US2276497A
Cited
US2407057A
Cited
US2409183A
Cited
US2436380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |