US2540822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal air-speed indicator
Assignee: Individual
•
Filing: 1945-04-06
•
Granted: 1951-02-06
•
Expires: 1965-04-06
Abstract
No abstract record available.
Inventors
- 👤 Charles E Hastings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1638894A
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US521168A
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US1264423A
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GB115729A
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US1766148A
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US1827252A
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US1996943A
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US1987642A
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US2193516A
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US2340899A
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US2314877A
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FR888695A
Cited
US2434433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |