US3275085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power operating and control system for tractors
Assignee: Massey Ferguson Inc
•
Filing: 1962-08-01
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Granted: 1966-09-27
•
Expires: 1982-08-01
Abstract
No abstract record available.
Inventors
- 👤 Ernest V Bunting
- 👤 Edwin J Skiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:00
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/1117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
IN A HYDRAULIC SYSTEM FOR A TRACTOR, INCLUDING A PRESSURE FLUID MAIN ACTUATOR FOR RAISING AND LOWERING AN IMPLEMENT COUPLED TO THE TRACTOR, THE COMBINATION OF A PUMP HAVING A FLUID SUPPLY CONNECTION TO THE MAIN ACTUATOR, VALVE MECHANISM INCLUDING FLOW CONTROL MEANS SHIFTABLE FROM A NEUTRAL POSITION IN WHICH FLUID IS LOCKED IN THE MAIN ACTUATOR INTO ALTERNATIVELY AVAILABLE SUPPLY AND EXHAUST POSITIONS IN WHICH PRESSURE FLUID IS RESPECTIVELY DELIVERED TO THE MAIN ACTUATOR AND DRAINED FROM THE MAIN ACTUATOR, MEANS BIASING SAID FLOW CONTROL MEANS TOWARD ONE OF SAID LATTER TWO POSITIONS, A SECOND PRESSURE FLUID OPERATED ACTUATOR OPERABLE TO SHIFT SAID FLOW CONTROL MEANS AGAINST ITS BIAS, PRESSURE RESPONSIVE MEANS CONNECTING SAID MAIN ACTUATOR AND SAID SECOND ACTUATOR FOR DRAINING SAID SECOND ACTUATOR WHEN THE PRESSURE IN THE MAIN ACTUATOR FALLS BELOW A PREDETERMINED VALUE AND OPENING SAID MAIN ACTUATOR TO SAID SECOND ACTUATOR WHEN THE PRESSURE IN THE MAIN ACTUATOR EXCEEDS THE PREDETERMINED VALUE AND
Claim 2
Dependent Claim
159 words
IN A HYDRAULIC SYSTEM FOR A TRACTOR, INCLUDING A PRESSURE FLUID MAIN ACTUATOR FOR RAISING AND LOWERING AN IMPLEMENT COUPLED TO THE TRACTOR, THE COMBINATION OF A PUMP HAVING A FLUID SUPPLY CONNECTION TO THE MAIN ACTUATOR, VALVE MECHANISM INCLUDING FLOW CONTROL MEANS SHIFTABLE FROM A NEUTRAL POSITION IN WHICH FLUID IS LOCKED IN THE MAIN ACTUATOR INTO ALTERNATIVELY AVAILABLE SUPPLY AND EXHAUST POSITIONS IN WHICH PRESSURE FLUID IS RESPECTIVELY DELIVERED TO THE MAIN ACTUATOR AND DRAINED FROM THE MAIN ACTUATOR, MEANS BIASING SAID FLOW CONTROL MEANS TOWARD ONE OF SAID LATTER TWO POSITIONS, A SECOND PRESSURE FLUID OPERATED ACTUATOR OPERABLE TO SHIFT SAID FLOW CONTROL MEANS AGAINST ITS BIAS, PRESSURE RESPONSIVE MEANS CONNECTING SAID MAIN ACTUATOR AND SAID SECOND ACTUATOR FOR DRAINING SAID SECOND ACTUATOR WHEN THE PRESSURE IN THE MAIN ACTUATOR FALLS BELOW A PREDETERMINED VALUE AND OPENING SAID MAIN ACTUATOR TO SAID SECOND ACTUATOR WHEN THE PRESSURE IN THE MAIN ACTUATOR EXCEEDS THE PREDETERMINED VALUE AND
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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) | 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 |