Patent US2540543A successfully refreshed from Google Patents.
US2540543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical lift aircraft control
Assignee: Individual
•
Filing: 1945-02-03
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Granted: 1951-02-06
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Expires: 1965-02-03
Abstract
No abstract record available.
Inventors
- 👤 Harvey E Neville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:56
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C13/00; B64C13/24; B64C13/38; B64C13/40; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1956
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1623049A
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US1864236A
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US1836406A
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US1919089A
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US1921805A
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US2021470A
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US2070610A
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US2256918A
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US2399076A
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US2394846A
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US2410533A
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US2491375A
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US2435080A
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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 |