Patent US3307584A successfully refreshed from Google Patents.
US3307584A
Expired / Lapsed
US
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Control system
Assignee: Weston Hydraulics Ltd
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Filing: 1965-10-22
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Granted: 1967-03-07
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Clyde F Czernek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:33
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/16; F15B9/17; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A SERVO VALVE SUITABLE FOR OPERATING AN ACTUATOR COMPRISING A HOUSING HAVING A BORE FORMED THEREIN, A PLURALITY OF CYLINDERS ARRANGED IN END-TO-END RELATIONSHIP SLIDABLY POSITIONED WITHIN SAID BORE FORMING A SERIES OF CYLINDERS, A PISTON RECIPROCALLY MOUNTED WITHIN EACH SAID CYLINDER, A PISTON ROD ASSOCIATED WITH EACH PISTON EXTENDING FROM SAID CYLINDER, AN INLET PASSAGE WITHIN SAID HOUSING ADAPTED TO RECEIVE FLUID UNDER PRESSURE, MEANS CONNECTING SAID INLET PASSAGE TO SAID FIRST BORE TO PROVIDE A BIAS AGAINST SAID SERIES, MEANS CONNECTING SAID INLET PASSAGE TO SAID FIRST BORE TO PROVIDE FOR ADMISSION OF FLUID WITHIN EACH SAID CYLINDER TO CAUSE RECIPROCATION OF SAID PISTON WITH RESPECT TO SAID CYLINDER, A FLOW CONTROL VALVE
Claim 2
Dependent Claim
115 words
A SERVO VALVE SUITABLE FOR OPERATING AN ACTUATOR COMPRISING A HOUSING HAVING A BORE FORMED THEREIN, A PLURALITY OF CYLINDERS ARRANGED IN END-TO-END RELATIONSHIP SLIDABLY POSITIONED WITHIN SAID BORE FORMING A SERIES OF CYLINDERS, A PISTON RECIPROCALLY MOUNTED WITHIN EACH SAID CYLINDER, A PISTON ROD ASSOCIATED WITH EACH PISTON EXTENDING FROM SAID CYLINDER, AN INLET PASSAGE WITHIN SAID HOUSING ADAPTED TO RECEIVE FLUID UNDER PRESSURE, MEANS CONNECTING SAID INLET PASSAGE TO SAID FIRST BORE TO PROVIDE A BIAS AGAINST SAID SERIES, MEANS CONNECTING SAID INLET PASSAGE TO SAID FIRST BORE TO PROVIDE FOR ADMISSION OF FLUID WITHIN EACH SAID CYLINDER TO CAUSE RECIPROCATION OF SAID PISTON WITH RESPECT TO SAID CYLINDER, A FLOW CONTROL VALVE
References Cited (Backward Citations)
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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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |