Patent US2861641A successfully refreshed from Google Patents.
US2861641A
Expired / Lapsed
US
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Control mountings for helicopter rotors
Assignee: Individual
•
Filing: 1955-02-28
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Granted: 1958-11-25
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Expires: 1975-02-28
Abstract
No abstract record available.
Inventors
- 👤 Igor B Bensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:26
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/52; B64C27/32; B64C27/37; B64C27/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA459070A
Cited
US2224357A
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US2264942A
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US2429502A
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US2510006A
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US2658575A
Cited
US2689011A
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US2677431A
Cited
US2631679A
Cited
US2702601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |