Patent US2546970A successfully refreshed from Google Patents.
US2546970A
Expired / Lapsed
US
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Direction finder system
Assignee: STC PLC
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Filing: 1945-02-24
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Granted: 1951-04-03
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Expires: 1965-02-24
Abstract
No abstract record available.
Inventors
- 👤 Henri G Busignies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:11
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/46; G01S1/00; G01S1/02; G01S5/00; G01S5/02; G01S5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1981884A
Cited
US2086742A
Cited
GB520778A
Cited
GB542634A
Cited
US2413620A
Cited
US2420408A
Cited
US2408048A
Cited
US2427219A
Cited
US2427220A
Cited
US2425008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |