Patent US2486059A successfully refreshed from Google Patents.
US2486059A
Expired / Lapsed
US
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Control mechanism for helicopters with coaxial rotors
Assignee: Individual
•
Filing: 1945-10-09
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Granted: 1949-10-25
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Expires: 1965-10-09
Abstract
No abstract record available.
Inventors
- 👤 Horace T Pentecost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:43
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/08; B64C27/10; B64C39/00; B64C39/02; B64C39/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1272846A
Cited
US1454944A
Cited
US1912354A
Cited
US2427936A
Cited
US2394846A
Cited
US2410533A
Cited
US2448073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |