US2493931A
Expired / Lapsed
US
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True air-speed meter
Assignee: Boeing Co
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Filing: 1946-01-19
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Granted: 1950-01-10
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Expires: 1966-01-19
Abstract
No abstract record available.
Inventors
- 👤 Marcus E Smaby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:25
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/14; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/929
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) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |