Patent US5197466A successfully refreshed from Google Patents.
US2508571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio echo detection apparatus
Assignee: United States, WAR, Secretary of
•
Filing: 1945-02-08
•
Granted: 1950-05-23
•
Expires: 1965-02-08
Abstract
No abstract record available.
Inventors
- 👤 Emmett L Hudspeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:41
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S7/41; G01S7/414
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2051537A
Cited
US2131042A
Cited
US2189549A
Cited
US2423644A
Cited
US2310692A
Cited
US2268643A
Cited
US2419205A
Cited
US2421028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |