US2969117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic pitch control system for rotors of helicopter aircraft
Assignee: Vyzkumny A Zkusebni Letecky Ustav AS
•
Filing: 1957-02-25
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Granted: 1961-01-24
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Schon Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:23
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/605
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256918A
Cited
US2394846A
Cited
GB572081A
Cited
US2529479A
Cited
US2486059A
Cited
US2755870A
Cited
US2748876A
Cited
US2689616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |