US3233525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid power control system
Assignee: Parker Hannifin Corp
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Filing: 1964-03-12
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Granted: 1966-02-08
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Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Hugh J Stacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:04
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A FLUID POWER SYSTEM COMPRISING A PUMP; FIRST AND SECOND FLUID MOTORS; FIRST AND SECOND CONTROL VALVES ARRANGED IN SERIES-PARALLEL AND HAVING FIRST AND SECOND VALVE MEMBERS THEREIN MOVABLE FROM SPRING-BIASED INACTIVE POSITION TO DETENT-HELD ACTIVE POSITION FOR ACTUATION OF THE RESPECTIVE MOTORS BY FLUID UNDER PRESSRUE FLOWING THEREINTO FROM SAID PUMP VIA SAID VALVES; AND A FLUID PRESSURE ACTUATED DETENT RELEASE MECHANISM ASSOCIATED WITH SAID FIRST VALVE AND RESPONSIVE TO BUILD UP OF PRESSURE IN SAID FIRST MOTOR AS AT THE END OF ITS WORKING STROKE TO RELEASE SAID FIRST VALVE MEMBER FOR SPRING RETURN TO INACTIVE POSITION WHEREBY, UPON SIMULTANEOUS MOVEMENT OF SAID VALVE MEMBERS TO ACTIVE POSITION, SAID FIRST AND SECOND MOTORS WILL BE ACTUATED AUTOMATICALLY IN THAT SEQUENCE.
Claim 2
Dependent Claim
122 words
A FLUID POWER SYSTEM COMPRISING A PUMP; FIRST AND SECOND FLUID MOTORS; FIRST AND SECOND CONTROL VALVES ARRANGED IN SERIES-PARALLEL AND HAVING FIRST AND SECOND VALVE MEMBERS THEREIN MOVABLE FROM SPRING-BIASED INACTIVE POSITION TO DETENT-HELD ACTIVE POSITION FOR ACTUATION OF THE RESPECTIVE MOTORS BY FLUID UNDER PRESSRUE FLOWING THEREINTO FROM SAID PUMP VIA SAID VALVES; AND A FLUID PRESSURE ACTUATED DETENT RELEASE MECHANISM ASSOCIATED WITH SAID FIRST VALVE AND RESPONSIVE TO BUILD UP OF PRESSURE IN SAID FIRST MOTOR AS AT THE END OF ITS WORKING STROKE TO RELEASE SAID FIRST VALVE MEMBER FOR SPRING RETURN TO INACTIVE POSITION WHEREBY, UPON SIMULTANEOUS MOVEMENT OF SAID VALVE MEMBERS TO ACTIVE POSITION, SAID FIRST AND SECOND MOTORS WILL BE ACTUATED AUTOMATICALLY IN THAT SEQUENCE.
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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |