Patent US2508400A successfully refreshed from Google Patents.
US2508400A
Expired / Lapsed
US
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Frequency-modulated direction- and range-finding apparatus
Assignee: Individual
•
Filing: 1945-01-24
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Granted: 1950-05-23
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Expires: 1965-01-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Martin V Kiebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:13
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2084760A
Cited
US2423023A
Cited
GB542634A
Cited
US2406953A
Cited
US2422134A
Cited
US2414096A
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 |