US2437251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized radio direction finder and homing device
Assignee: Unisys Corp
•
Filing: 1943-08-21
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Granted: 1948-03-09
•
Expires: 1963-08-21
Abstract
No abstract record available.
Inventors
- 👤 Carl A Frische
- 👤 Jr Thomas M Ferrill
- 👤 John M Slater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/38; G01S3/42; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1286
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1726643A
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US1569325A
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US1825345A
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US2207709A
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US2201174A
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US2257757A
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US2369622A
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US2288102A
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US2315755A
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US2366543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |