Patent US2922930A successfully refreshed from Google Patents.
US2502974A
Expired / Lapsed
US
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Blind landing system
Assignee: United States, WAR, Secretary of
•
Filing: 1943-05-14
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Granted: 1950-04-04
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Expires: 1963-05-14
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Mcelhannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/82; G01S13/88; G01S13/91; G01S13/913; G01S7/00; G01S7/02; G01S7/04; G01S7/06
Claims Analysis
Total Claims: 0
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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) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |