Patent US2613751A successfully refreshed from Google Patents.
US2613751A
Expired / Lapsed
US
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Helicopter control
Assignee: Curtiss Wright Corp
•
Filing: 1947-02-04
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Granted: 1952-10-14
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Expires: 1967-02-04
Abstract
No abstract record available.
Inventors
- 👤 Allen F Donovan
- 👤 Hirsch Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:58
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2217364A
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US2115485A
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US2209879A
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US2317341A
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US2343378A
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US2318260A
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US2378558A
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US2364116A
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US2399685A
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US2517150A
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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) | 1955-10-14 | 1956-04-14 | 1956-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-14 | 1960-04-14 | 1960-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-14 | 1964-04-14 | 1964-10-14 | $7700.00 | Window Closed / Lapsed |