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US3136224A
Expired / Lapsed
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Dual flow-synchronized electrohydraulic servo
Assignee: North American Aviation Corp
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Filing: 1960-11-04
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Granted: 1964-06-09
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Expires: 1980-11-04
Abstract
No abstract record available.
Inventors
- 👤 Alfonso S Escobosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:01
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B9/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A DUAL TANDEM FLUID ACTUATOR HAVING A SINGLE OUTPUT MEMBER; FIRST AND SECOND VALVE MEANS FOR CONTROLLING FLUID FLOW TO AND FROM SAID FLUID ACTUATOR, MEANS RESPONSIVE TO ACTUATOR POSITION OUTPUT FOR PROVIDING A NEGATIVE POSITION FEEDBACK SIGNAL TO SAID VALVE MEANS FOR SERVO CONTROL OF ACTUATOR POSITION OUTPUT; AND INTERGRATING MEANS RESPONSIVE TO FLUID FLOW THROUGH SAID VALVE MEANS FOR PROVIDING AN OUTPUT SIGNAL REPRESENTING THE TIME INTEGRAL OF THE DIFFERENCE BETWEEN THE FLUID FLOW THROUGH EACH SAID VALVE MEANS, SAID VALVE MEANS BEING RESPONSIVELY CONNECTED TO SAID INTEGRATING MEANS, WHEREBY SAID INTEGRATING MEANS COOPERATES WITH SAID VALVE MEANS TO REDUCE DIFFERENCE BETWEEN FLOW THROUGH SAID VALVES.
Claim 2
Dependent Claim
108 words
A DUAL TANDEM FLUID ACTUATOR HAVING A SINGLE OUTPUT MEMBER; FIRST AND SECOND VALVE MEANS FOR CONTROLLING FLUID FLOW TO AND FROM SAID FLUID ACTUATOR, MEANS RESPONSIVE TO ACTUATOR POSITION OUTPUT FOR PROVIDING A NEGATIVE POSITION FEEDBACK SIGNAL TO SAID VALVE MEANS FOR SERVO CONTROL OF ACTUATOR POSITION OUTPUT; AND INTERGRATING MEANS RESPONSIVE TO FLUID FLOW THROUGH SAID VALVE MEANS FOR PROVIDING AN OUTPUT SIGNAL REPRESENTING THE TIME INTEGRAL OF THE DIFFERENCE BETWEEN THE FLUID FLOW THROUGH EACH SAID VALVE MEANS, SAID VALVE MEANS BEING RESPONSIVELY CONNECTED TO SAID INTEGRATING MEANS, WHEREBY SAID INTEGRATING MEANS COOPERATES WITH SAID VALVE MEANS TO REDUCE DIFFERENCE BETWEEN FLOW THROUGH SAID VALVES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |