US2613352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation system
Assignee: Unisys Corp
•
Filing: 1949-11-18
•
Granted: 1952-10-07
•
Expires: 1969-11-18
Abstract
No abstract record available.
Inventors
- 👤 Kellogg Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:06
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/10; G05D1/101; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306552A
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US1436280A
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US1703280A
Cited
US1703317A
Cited
US2257757A
Cited
GB516567A
Cited
US2372185A
Cited
GB594484A
Cited
US2502721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |