US2471408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio obstacle detection apparatus
Assignee: STC PLC
•
Filing: 1942-10-08
•
Granted: 1949-05-31
•
Expires: 1962-10-08
Abstract
No abstract record available.
Inventors
- 👤 Henri G Busignies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:20
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1924174A
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US2143035A
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US2171536A
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US2227598A
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US2243234A
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US2300189A
Cited
US2221666A
Cited
US2345932A
Cited
US2364190A
Cited
US2416088A
Cited
US2355363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |