US2648839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction finding antenna system
Assignee: RCA Corp
•
Filing: 1950-10-02
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Granted: 1953-08-11
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Expires: 1970-10-02
Abstract
No abstract record available.
Inventors
- 👤 John R Ford
- 👤 Bollinger Waldon Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:43
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; G; G01; G01S; G01S1/00; G01S1/02; G01S13/00; G01S13/88; G01S13/91; G01S13/913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |