US2540190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet rotated rotary wing aircraft
Assignee: Fairey Aviation Co Ltd
•
Filing: 1946-10-23
•
Granted: 1951-02-06
•
Expires: 1966-10-23
Abstract
No abstract record available.
Inventors
- 👤 Doblhoff Friedrich List
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:23
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7822; Y10T137/7823
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US523734A
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GB227151A
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FR633136A
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FR687482A
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GB366450A
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US2330056A
Cited
US2329323A
Cited
US2371687A
Cited
US2397357A
Cited
GB556866A
Cited
GB556865A
Cited
US2384088A
Cited
US2396130A
Cited
US2457936A
Cited
US2446129A
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 |