US3275084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor hydraulic control system
Assignee: Massey Ferguson Inc
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Filing: 1964-01-31
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Granted: 1966-09-27
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Expires: 1984-01-31
Abstract
No abstract record available.
Inventors
- 👤 Ernest V Bunting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:30
CPC Classifications
B; B62; B62D; B62D49/00; B62D49/02; A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
IN A TRACTOR HAVING A HITCH LINKAGE AND HYDRAULIC ACTUATOR FOR LIFTING SAID LINKAGE UPON ADMISSION OF FLUID UNDER PRESSURE TO SAID ACTUATOR, A CONTROL SYSTEM COMPRISING, IN COMBINATION, A SOURCE OF FLUID UNDER PRESSURE INCLUDING A CONTROL VALVE ARRANGED TO DIRECT FLUID TO AND FROM SAID ACTUATOR, A DRAFT CONTROL LINKAGE COUPLING SAID HITCH LINKAGE AND SAID VALVE FOR DISCHARGING FLUID FROM SAID ACTUATOR UPON A DECREASE FROM A PREDETERMINED DRAFT LOAD ON SAID HITCH LINKAGE, A POSITION CONTROL LINKAGE COUPLING SAID HITCH LINKAGE AND SAID VALVE FOR STOPPING THE ADDITION OF FLUID TO SAID ACTUATOR WHEN THE HITCH LINKAGE REACHES A PREDETERMINED HEIGHT, AND A PRESSURE CONTROL LINKAGE INCLUDING MEANS FOR SENSING THE FLUID PRESSURE IN SAID ACTUATOR CONNECTED TO SAID VALVE FOR STOPPING THE ADDITION OF FLUID TO SAID ACTUATOR WHEN A PREDETERMINED PRESSURE IS EXCEEDED, SAID DRAFT CONTROL LINKAGE, POSITION CONTROL LINKAGE AND PRESSURE CONTROL LINKAGE EACH BEING EFFECTIVE TO TAKE OVER AND OVERRIDE THE OTHERS FOR STOPPING THE ADDITION OF FLUID TO SAID ACTUATOR WHEN A CORRESPONDING ONE OF SAID PREDETERMINED LOAD, HEIGHT OR PRESSURE CONDITIONS IS REACHED.
Claim 2
Dependent Claim
183 words
IN A TRACTOR HAVING A HITCH LINKAGE AND HYDRAULIC ACTUATOR FOR LIFTING SAID LINKAGE UPON ADMISSION OF FLUID UNDER PRESSURE TO SAID ACTUATOR, A CONTROL SYSTEM COMPRISING, IN COMBINATION, A SOURCE OF FLUID UNDER PRESSURE INCLUDING A CONTROL VALVE ARRANGED TO DIRECT FLUID TO AND FROM SAID ACTUATOR, A DRAFT CONTROL LINKAGE COUPLING SAID HITCH LINKAGE AND SAID VALVE FOR DISCHARGING FLUID FROM SAID ACTUATOR UPON A DECREASE FROM A PREDETERMINED DRAFT LOAD ON SAID HITCH LINKAGE, A POSITION CONTROL LINKAGE COUPLING SAID HITCH LINKAGE AND SAID VALVE FOR STOPPING THE ADDITION OF FLUID TO SAID ACTUATOR WHEN THE HITCH LINKAGE REACHES A PREDETERMINED HEIGHT, AND A PRESSURE CONTROL LINKAGE INCLUDING MEANS FOR SENSING THE FLUID PRESSURE IN SAID ACTUATOR CONNECTED TO SAID VALVE FOR STOPPING THE ADDITION OF FLUID TO SAID ACTUATOR WHEN A PREDETERMINED PRESSURE IS EXCEEDED, SAID DRAFT CONTROL LINKAGE, POSITION CONTROL LINKAGE AND PRESSURE CONTROL LINKAGE EACH BEING EFFECTIVE TO TAKE OVER AND OVERRIDE THE OTHERS FOR STOPPING THE ADDITION OF FLUID TO SAID ACTUATOR WHEN A CORRESPONDING ONE OF SAID PREDETERMINED LOAD, HEIGHT OR PRESSURE CONDITIONS IS REACHED.
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) | 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 |