US3570243A
Expired / Lapsed
US
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Hydraulic actuator control system
Assignee: Mobility Systems Inc
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Filing: 1968-12-09
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Granted: 1971-03-16
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Expires: 1988-12-09
Abstract
Abstract A HYDRAULIC CONTROL SYSTEM WHEREIN A POSITIVE DISPLACEMENT HYDRAULIC PUMP MEANS IS VARIABLY CONTROLLED TO DRIVE THE PISTON OF A HYDRAULIC CYLINDER TO A SELECTED POSITION. THE PUMP MEANS IS DRIVEN BY A SHUNT-WOUND DC MOTOR MEANS WHICH IS ENERGIZED IN RESPONSE TO THE OUTPUT OF AN ELECTRONIC SIGNAL GENERATING MEANS WHICH IS RESPONSIVE TO THE DIFFERENCE BETWEEN A PISTON POSITION SENSE SIGNAL AND A POSITION COMMAND SIGNAL. THE ELECTRONIC SIGNAL GENERATING MEANS ALSO INCLUDE AN AUTOMATIC DISABLING CIRCUIT WHICH PREVENTS OVERSHOOT AND OSCILLATION IN THE HYDRAULIC CYLINDER.
Inventors
- 👤 Donald T Comer
- 👤 Ronald D Irvin
- 👤 Robert E Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:15
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/34; B66B1/36; B66B1/40; B66B1/405; F; F15; F15B; F15B21/00; F15B21/08; F15B21/087; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |