US3095933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control system
Assignee: Massey Ferguson Inc
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Filing: 1960-02-23
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Granted: 1963-07-02
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Expires: 1980-02-23
Abstract
No abstract record available.
Inventors
- 👤 Ernest V Bunting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:04
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/114; A01B63/1145; Y; Y10; Y10S; Y10S60/00; Y10S60/907
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
150 words
IN AN OPERATING AND CONTROL SYSTEM FOR THE VERTICALLY SWINGABLE IMPLEMENT HITCH LINKAGE OF A TRACTOR, IN COMBINATION, A PRESSURE FLUID OPERATED ACTUATOR MOUNTED ON THE TRACTOR AND OPERATIVELY CONNECTED TO THE LINKAGE, MAIN CONTROL VALVE MEANS OPERABLE TO DIRCET FLUID UNDER PRESSURE TO SAID ACTUATOR TO RAISE THE LINKAGE AND IMPLEMENT ATTACHED THERETO, SAID VALVE MEANS INCLUDING A FLOW RESTRICTING DROP PORT AND BEING FURTHER OPERATIVE TO VENT SAID ACTUATOR TO EXHAUST THROUGH SAID PORT TO PERMIT DESCENT OF THE LINKAGE AND ATTACHED IMPLEMENT UNDER THE ACTION OF THE LOAD IMPOSED ON THE LINKAGE BY THE IMPLEMENT, AND AUXILIARY VALVE MEANS INTERPOSED BETWEEN SAID ACTUATOR AND SAID MAIN VALVE MEANS OPERATIVE TO RESTRICT THE EXHAUST OF FLUID FROM THE RAM TO A RATE SUCH THAT THE PRESSURE OF THE FLUID AT THE DROP PORT IS PRECLUDED FROM RISING ABOVE A PREDETERMINED VALUE WHETHER THE PORT IS OPEN OR CLOSED.
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) | 1966-07-01 | 1966-12-31 | 1967-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-01 | 1970-12-31 | 1971-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-01 | 1974-12-31 | 1975-07-02 | $7700.00 | Window Closed / Lapsed |