US3156098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic power system
Assignee: Ford Motor Co
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Filing: 1959-11-20
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Granted: 1964-11-10
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Expires: 1979-11-20
Abstract
No abstract record available.
Inventors
- 👤 Rou Albert M La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:59
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; F15B13/00; F15B13/02; F15B13/06; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20576; F15B2211/20584; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/31; F15B2211/3105; F15B2211/3116; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5153; F15B2211/5154; F15B2211/70; F15B2211/71; F15B2211/7142; F15B2211/78; F15B2211/781
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
IN A HYDRAULIC POWER TRANSMISSION HAVING A PAIR OF DRIVEN PUMPS FOR ACTUATING A PLURALITY OF HYDRAULIC CYLINDERS, A SELECTOR VALVE COMPRISING A HOUSING AND A PLURALITY OF VALVE SPOOLS IN SAID HOUSING SELECTIVELY OPERABLE TO DIRECT FLUID FLOW TO SAID CYLINDERS, PORTS OPERATIVELY ASSOCIATED WITH SAID SPOOLS AND PASSAGES CONNECTED WITH SAID PORTS FORMING AN OPEN CENTER PRESSURE DISTRIBUTION SYSTEM, MEANS CONNECTING ONE OF SAID PUMPS TO ONE END OF SAID OPEN CENTER SYSTEM, MEANS CONNECTING THE OTHER PUMP TO SAID SYSTEM BETWEEN CERTAIN OF SAID SPOOLS, AN UNLOADING VALVE DISPOSED IN SAID HOUSING BETWEEN CERTAIN OF THE VALVE SPOOLS AND OPERABLE TO VENT A PORTION OF THE SYSTEM AT PRE-SELECTED PRESSURE, AND A CHECK VALVE DISPOSED BETWEEN THE UNLOADING VALVE AND THE REMAINDER OF THE SYSTEM AND OPERABLE TO CLOSE TO PREVENT VENTING OF SAID REMAINDER OF THE SYSTEM BY OPERATION OF THE UNLOADING VALVE.
Claim 2
Dependent Claim
147 words
IN A HYDRAULIC POWER TRANSMISSION HAVING A PAIR OF DRIVEN PUMPS FOR ACTUATING A PLURALITY OF HYDRAULIC CYLINDERS, A SELECTOR VALVE COMPRISING A HOUSING AND A PLURALITY OF VALVE SPOOLS IN SAID HOUSING SELECTIVELY OPERABLE TO DIRECT FLUID FLOW TO SAID CYLINDERS, PORTS OPERATIVELY ASSOCIATED WITH SAID SPOOLS AND PASSAGES CONNECTED WITH SAID PORTS FORMING AN OPEN CENTER PRESSURE DISTRIBUTION SYSTEM, MEANS CONNECTING ONE OF SAID PUMPS TO ONE END OF SAID OPEN CENTER SYSTEM, MEANS CONNECTING THE OTHER PUMP TO SAID SYSTEM BETWEEN CERTAIN OF SAID SPOOLS, AN UNLOADING VALVE DISPOSED IN SAID HOUSING BETWEEN CERTAIN OF THE VALVE SPOOLS AND OPERABLE TO VENT A PORTION OF THE SYSTEM AT PRE-SELECTED PRESSURE, AND A CHECK VALVE DISPOSED BETWEEN THE UNLOADING VALVE AND THE REMAINDER OF THE SYSTEM AND OPERABLE TO CLOSE TO PREVENT VENTING OF SAID REMAINDER OF THE SYSTEM BY OPERATION OF THE UNLOADING VALVE.
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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) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |