Patent US2494553A successfully refreshed from Google Patents.
US2494553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction finding system
Assignee: Individual
•
Filing: 1945-10-16
•
Granted: 1950-01-17
•
Expires: 1965-10-16
Abstract
No abstract record available.
Inventors
- 👤 Paul G Hansel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:25
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1908006A
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US2238129A
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US2213273A
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US2263377A
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US2297414A
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US2314093A
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US2388262A
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US2403967A
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US2380929A
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US2405203A
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US2403727A
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US2407281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |