US3274902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control system
Assignee: Deere and Co
•
Filing: 1965-10-22
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Granted: 1966-09-27
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Richard M Kleckner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:34
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/01; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87233; Y10T137/87241
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A HYDRAULIC SYSTEM COMPRISING: A SOURCE OF FLUID PRESSURE; A HYDRAULIC MOTOR HAVING ALTERNATE INLETS; A FIRST AND SECOND CONDUIT MEANS RESPECTIVELY CONNECTED TO SAID ALTERNATE INLETS; A CONTROL VALVE MEANS OPERATIVELY CONNECTED TO THE SOURCE AND FLUID PRESSURE AND TO SAID FIRST AND SECOND CONDUIT MEANS FOR SELECTIVELY SUPPLYING FLUID UNDER PRESSURE TO SAID CONDUIT MEANS; A FIRST AND SECOND CHECK VALVE RESPECTIVELY MOUNTED IN SAID FIRST AND SECOND CONDUIT MEANS BETWEEN THE CONTROL VALVE MEANS AND THE MOTOR AND BIASED AGAINST RETURN OF FLUID FROM SAID MOTOR; A THIRD CONDUIT MEANS INTERCONNECTING THE FIRST AND SECOND CONDUIT MEANS BETWEEN THE CONTROL VALVE MEANS AND THE FIRST AND SECOND CHECK VALVES RESPECTIVELY; A PAIR OF CHECK VALVES OPERABLY MOUNTED IN SAID THIRD CONDUIT MEANS FOR PREVENTING THE FLOW OF FLUID FROM THE THIRD CONDUIT MEANS TO THE FIRST AND SECOND CONDUIT MEANS RESPECTIVELY; AND HYDRAULIC MEANS ACTUATED BY FLUID PRESSURE BETWEEN THE CHECK VALVES IN THE THRIRD CONDUIT MEANS TO UNSEAT THE FIRST AND SECOND CHECK VALVES.
Claim 2
Dependent Claim
168 words
A HYDRAULIC SYSTEM COMPRISING: A SOURCE OF FLUID PRESSURE; A HYDRAULIC MOTOR HAVING ALTERNATE INLETS; A FIRST AND SECOND CONDUIT MEANS RESPECTIVELY CONNECTED TO SAID ALTERNATE INLETS; A CONTROL VALVE MEANS OPERATIVELY CONNECTED TO THE SOURCE AND FLUID PRESSURE AND TO SAID FIRST AND SECOND CONDUIT MEANS FOR SELECTIVELY SUPPLYING FLUID UNDER PRESSURE TO SAID CONDUIT MEANS; A FIRST AND SECOND CHECK VALVE RESPECTIVELY MOUNTED IN SAID FIRST AND SECOND CONDUIT MEANS BETWEEN THE CONTROL VALVE MEANS AND THE MOTOR AND BIASED AGAINST RETURN OF FLUID FROM SAID MOTOR; A THIRD CONDUIT MEANS INTERCONNECTING THE FIRST AND SECOND CONDUIT MEANS BETWEEN THE CONTROL VALVE MEANS AND THE FIRST AND SECOND CHECK VALVES RESPECTIVELY; A PAIR OF CHECK VALVES OPERABLY MOUNTED IN SAID THIRD CONDUIT MEANS FOR PREVENTING THE FLOW OF FLUID FROM THE THIRD CONDUIT MEANS TO THE FIRST AND SECOND CONDUIT MEANS RESPECTIVELY; AND HYDRAULIC MEANS ACTUATED BY FLUID PRESSURE BETWEEN THE CHECK VALVES IN THE THRIRD CONDUIT MEANS TO UNSEAT THE FIRST AND SECOND CHECK VALVES.
References Cited (Backward Citations)
US2593039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |