Patent US2695674A successfully refreshed from Google Patents.
US2695674A
Expired / Lapsed
US
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Control system for multiple rotor helicopters
Assignee: Kaman Aircraft Corp
•
Filing: 1949-09-14
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Granted: 1954-11-30
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Expires: 1969-09-14
Abstract
No abstract record available.
Inventors
- 👤 Charles H Kaman
- 👤 Martin L Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:13
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/08; B64C27/54; B64C27/58; B64C27/59; B64C27/615; Y; Y02; Y02T; Y02T50/00; Y02T50/30
Claims Analysis
Total Claims: 0
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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) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |