US2544677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio trail navigational system
Assignee: RCA Corp
•
Filing: 1945-03-06
•
Granted: 1951-03-13
•
Expires: 1965-03-06
Abstract
No abstract record available.
Inventors
- 👤 Jr John Hays Hammond
- 👤 Ellison S Purington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:54
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1525783A
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GB151389A
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US2153209A
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FR804966A
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US2207709A
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US2134716A
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US2257320A
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US2423644A
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US2272312A
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US2311435A
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US2432984A
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US2407169A
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US2426189A
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US2408848A
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US2433804A
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US2396112A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |