Patent US3261406A successfully refreshed from Google Patents.
US3261406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attitude control system for an aeronautical propeller
Assignee: RTX Corp
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Filing: 1963-05-16
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Granted: 1966-07-19
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Expires: 1983-05-16
Abstract
No abstract record available.
Inventors
- 👤 Robert B Goodman
- 👤 Richard L Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:26
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/38; B64C11/40; B64C29/00; B64C29/0091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
FOR AN AERONAUTICAL PROPELLER HAVING VARIABLE PITCH BLADES ADAPTED TO PROPEL AIRCRAFT, AN AUTOPILOT MOUNTED ON SAID AIRCRAFT FOR AUTOMATICALLY CONTROLLING THE ATTITUDE OF SAID AIRCRAFT, CONTROL MEANS FOR VARYING THE PITCH OF SAID BLADES OF SAID RPROPELLER SO AS TO KEEP THE R.P.M. OF THE PROPELLER AT A PRESELECTED CONSTANT VALUE, TRANSDUCER MEANS RESPONSIVE TO AN ELECTRICAL SIGNAL FROM SAID AUTOPILOT FOR PRODUCING A MECHANICAL OUTPUT SIGNAL PROPORTIONAL TO SAID ELECTRICAL SIGNAL, HYDRAULICALLY ACTUATED
Claim 2
Dependent Claim
75 words
FOR AN AERONAUTICAL PROPELLER HAVING VARIABLE PITCH BLADES ADAPTED TO PROPEL AIRCRAFT, AN AUTOPILOT MOUNTED ON SAID AIRCRAFT FOR AUTOMATICALLY CONTROLLING THE ATTITUDE OF SAID AIRCRAFT, CONTROL MEANS FOR VARYING THE PITCH OF SAID BLADES OF SAID RPROPELLER SO AS TO KEEP THE R.P.M. OF THE PROPELLER AT A PRESELECTED CONSTANT VALUE, TRANSDUCER MEANS RESPONSIVE TO AN ELECTRICAL SIGNAL FROM SAID AUTOPILOT FOR PRODUCING A MECHANICAL OUTPUT SIGNAL PROPORTIONAL TO SAID ELECTRICAL SIGNAL, HYDRAULICALLY ACTUATED
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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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |