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 22:22
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2137847A
Cited
US2405238A
Cited
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 |