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Patent US2587995A successfully refreshed from Google Patents.
US2587995A
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System for guiding airplanes in flight
Assignee: United States Department of the Navy
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Filing: 1943-10-05
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Granted: 1952-03-04
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Expires: 1963-10-05
Abstract
No abstract record available.
Inventors
- 👤 David T Griggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:58
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/12; H01Q3/16; H01Q3/18; G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/42; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/422
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2082347A
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US2165256A
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US2314795A
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US2288815A
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GB557903A
Cited
GB557870A
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US2433381A
Cited
US2429601A
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US2405930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |