US3198088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid motor control system
Assignee: Caterpillar Inc
•
Filing: 1963-08-13
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Granted: 1965-08-03
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Expires: 1983-08-13
Abstract
No abstract record available.
Inventors
- 👤 Howard L Johnson
- 👤 John A Junck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:26
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/09; F; F15; F15B; F15B13/00; F15B13/01; F15B13/015; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86984
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A CONTROL SYSTEM FOR A DOUBLE ACTING HYDRAULIC JACK COMPRISING A VALVE FOR DIRECTING FLUID UNDER PRESSURE TO EITHER END OF THE JACK AND VENTING THE OPPOSITE END, A PAIR OF ALIGNED AND OPPOSED CHECK VALVES NORMALLY CLOSED TO PREVENT FLOW FROM BOTH ENDS OF THE JACKS, A NORMALLY SPRING CLOSED PRESSURE BREAKER VALVE SMALLER THAN AND DISPOSED IN EACH CHECK VALVE, A SPRING FOR EACH CHECK VALVE AND A SEPARATE SPRING FOR EACH PRESSURE BREAKER VALVE INDEPENDENT OF THE CHECK VALVE SPRING, A CYLINDER CONTAING A PISTON MOVABLE IN OPPOSITE DIRECTIONS TO ENGAGE AND OPEN ONE OR THE OTHER OF SAID PRESSURE VALVES, AND MEANS TO COMMUNICATE PRESSURE DIRECTED TO EITHER END OF THE JACK TO ONE END OF SAID PISTON TO CAUSE IT TO OPEN THE PRESSURE BREAKER VALVE ASSOCIATED WITH THE OPPOSITE END OF THE JACK, THE CROSS SECTIONAL AREA OF SAID PISTON BEING GREATER THAN THE PRESSURE BREAKER VALVES AND LESS THAN THE CHECK VALVES.
Claim 2
Dependent Claim
159 words
A CONTROL SYSTEM FOR A DOUBLE ACTING HYDRAULIC JACK COMPRISING A VALVE FOR DIRECTING FLUID UNDER PRESSURE TO EITHER END OF THE JACK AND VENTING THE OPPOSITE END, A PAIR OF ALIGNED AND OPPOSED CHECK VALVES NORMALLY CLOSED TO PREVENT FLOW FROM BOTH ENDS OF THE JACKS, A NORMALLY SPRING CLOSED PRESSURE BREAKER VALVE SMALLER THAN AND DISPOSED IN EACH CHECK VALVE, A SPRING FOR EACH CHECK VALVE AND A SEPARATE SPRING FOR EACH PRESSURE BREAKER VALVE INDEPENDENT OF THE CHECK VALVE SPRING, A CYLINDER CONTAING A PISTON MOVABLE IN OPPOSITE DIRECTIONS TO ENGAGE AND OPEN ONE OR THE OTHER OF SAID PRESSURE VALVES, AND MEANS TO COMMUNICATE PRESSURE DIRECTED TO EITHER END OF THE JACK TO ONE END OF SAID PISTON TO CAUSE IT TO OPEN THE PRESSURE BREAKER VALVE ASSOCIATED WITH THE OPPOSITE END OF THE JACK, THE CROSS SECTIONAL AREA OF SAID PISTON BEING GREATER THAN THE PRESSURE BREAKER VALVES AND LESS THAN THE CHECK 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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |