Patent US3393508A successfully refreshed from Google Patents.
US3393508A
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Hydraulic actuator having position responsive relief valve means
Assignee: TDK Micronas GmbH
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Filing: 1966-09-26
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Granted: 1968-07-23
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Ray William Alton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:50
CPC Classifications
F; F15; F15B; F15B9/00; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2093; G05D16/2097; Y; Y10; Y10S; Y10S60/00; Y10S60/907
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
A HYDRAULIC ACTUATOR AND CONTROL SYSTEM THEREFOR COMPRISING: A FLUID PRESSURE SOURCE; A CONDUIT MEANS CONNECTED TO THE OUTPUT OF SAID SOURCE; A DEVICE CONNECTED TO SAID CONDUIT MEANS OPERATED BY FLUID PRESSURE DEVELOPED BY SAID SOURCE; MEANS CONNECTED TO SAID CONDUIT MEANS FOR BLEEDING THE PRESSURE IN SAID CONDUIT MEANS TO CONTROL THE PRESSURE APPLIED TO SAID DEVICE; MEANS BLOCKING SAID BLEEDING MEANS UNTIL SAID DEVICE HAS BEEN ACTUATED A MINIMUM AMOUNT BY THE PRESSURE APPLIED TO THE DEVICE; AND A RELIEF VALVE CONNECTED TO SAID SOURCE FOR BYPASSING FROM SAID DEVICE A PORTION OF THE OUTPUT FROM SAID SOURCE AFTER SAID DEVICE HAS MOVED SAID MINIMUM AMOUNT, SAID RELIEF VALVE BEING CONTROLLED BY THE PRESSURE IN SAID CONDUIT MEANS BETWEEN SAID BLOCKING MEANS AND SAID BLEED MEANS.
Claim 2
Dependent Claim
129 words
A HYDRAULIC ACTUATOR AND CONTROL SYSTEM THEREFOR COMPRISING: A FLUID PRESSURE SOURCE; A CONDUIT MEANS CONNECTED TO THE OUTPUT OF SAID SOURCE; A DEVICE CONNECTED TO SAID CONDUIT MEANS OPERATED BY FLUID PRESSURE DEVELOPED BY SAID SOURCE; MEANS CONNECTED TO SAID CONDUIT MEANS FOR BLEEDING THE PRESSURE IN SAID CONDUIT MEANS TO CONTROL THE PRESSURE APPLIED TO SAID DEVICE; MEANS BLOCKING SAID BLEEDING MEANS UNTIL SAID DEVICE HAS BEEN ACTUATED A MINIMUM AMOUNT BY THE PRESSURE APPLIED TO THE DEVICE; AND A RELIEF VALVE CONNECTED TO SAID SOURCE FOR BYPASSING FROM SAID DEVICE A PORTION OF THE OUTPUT FROM SAID SOURCE AFTER SAID DEVICE HAS MOVED SAID MINIMUM AMOUNT, SAID RELIEF VALVE BEING CONTROLLED BY THE PRESSURE IN SAID CONDUIT MEANS BETWEEN SAID BLOCKING MEANS AND SAID BLEED MEANS.
Claim 3
Dependent Claim
38 words
THE SYSTEM OF CLAIM 1 WHEREIN SAID SOURCE COMPRISES AN ELECTRIC MOTOR DRIVING A PAIR OF PUMP UNITS EACH INCLUDING A PISTON, A CYLINDER, AND AN OUTLET VALVE, WITH ONE OF SAID UNITS HAVING A CONSIDERABLY GREATER OUTPUT
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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) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |