US2633570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation system
Assignee: Individual
•
Filing: 1945-10-19
•
Granted: 1953-03-31
•
Expires: 1965-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Ivan A Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:16
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2137847A
Cited
US2405238A
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GB552072A
Cited
US2408048A
Cited
US2403527A
Cited
US2408848A
Cited
US2399661A
Cited
US2396112A
Cited
US2512923A
Cited
US2430570A
Cited
US2445361A
Cited
US2508565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |