US2539402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finder
Assignee: STC PLC
•
Filing: 1946-01-03
•
Granted: 1951-01-30
•
Expires: 1966-01-03
Abstract
No abstract record available.
Inventors
- 👤 Trevor H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:42
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2412702A
Cited
US2284475A
Cited
FR873067A
Cited
US2400641A
Cited
US2392420A
Cited
US2415566A
Cited
US2413981A
Cited
US2412682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |