Patent US3412375A successfully refreshed from Google Patents.
US3412375A
Expired / Lapsed
US
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Doppler shift aircraft landing aid and method
Assignee: General Electric Co
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Filing: 1966-09-16
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Granted: 1968-11-19
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Expires: 1986-09-16
Abstract
No abstract record available.
Inventors
- 👤 George F Prehmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:47
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/14; G01S1/00; G01S1/02; G01S5/00; G01S5/18; G01S5/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |