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US2869366A
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Vortex frequency airspeed indicator
Assignee: Northrop Grumman Corp
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Filing: 1955-03-21
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Granted: 1959-01-20
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Expires: 1975-03-21
Abstract
No abstract record available.
Inventors
- 👤 Nitikman Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:46
CPC Classifications
G; G01; G01P; G01P5/00; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/3209; G01F1/325; G01F1/3259; G01P5/01; Y; Y10; Y10S; Y10S415/00; Y10S415/914
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |