Patent US1776398A successfully refreshed from Google Patents.
Patent US2774309A successfully refreshed from Google Patents.
Patent US3168146A successfully refreshed from Google Patents.
US3168146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor hydraulic systems
Assignee: Ford Motor Co
•
Filing: 1961-11-02
•
Granted: 1965-02-02
•
Expires: 1981-11-02
Abstract
No abstract record available.
Inventors
- 👤 William R Price
- 👤 William J Foxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:03
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/112; Y; Y10; Y10S; Y10S60/00; Y10S60/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
IN A TRACTOR HAVING A 3-POINT IMPLEMENT HITCH AND A HYDRAULIC SYSTEM, INCLUDING A PUMP AND A LIFT CYLINDER, FOR LIFTING AND LOWERING THE HITCH, MEANS FOR SENSING DRAFT ON AN IMPLEMENT ATTACHED TO THE HITCH, A VALVE FOR CONTROLLING PASSAGE OF HYDRAULIC FLUID TO AND FROM SAID LIFT CYLINDER RESPONSIVE TO SENSED DRAFT ON THE IMPLEMENT TO MAINTAIN A MORE OR LESS UNIFORM DRAFT, A CONTROL LEVER FOR OPERATING THE VALVE TO RAISE AND LOWER THE HITCH TO MOVE THE IMPLEMENT BETWEEN OPERATING AND NON-OPERATING POSITION, A FLOW CONTROL VALVE INTERPOSED BETWEEN THE PUMP AND THE CYLINDER AND MANUALLY ADJUSTABLE FOR SUPPLYING FLUID TO THE CYLINDER AT A MAXIMUM RATE OF FLOW AND AT SELECTED RATES BELOW SAID MAXIMUM RATE, AND A MECHANICAL LINKAGE LOCATED IN THE PATH OF MOVEMENT OF THE CONTROL LEVER AND CONNECTED WITH THE FLOW CONTROL VALVE, SAID LINKAGE BEING INDEPENDENT OF THE DRAFT SENSING MEANS AND ENGAGED AND ACTUATED SOLELY BY MOVEMENT OF THE CONTROL LEVER TO RAISE THE IMPLEMENT TO NONOPERATING POSITION, AND ACTUATION OF SAID LINKAGE MOVING THE FLOW CONTROL VALVE TO PROVIDE MAXIMUM RATE OF FLOW.
Claim 2
Dependent Claim
185 words
IN A TRACTOR HAVING A 3-POINT IMPLEMENT HITCH AND A HYDRAULIC SYSTEM, INCLUDING A PUMP AND A LIFT CYLINDER, FOR LIFTING AND LOWERING THE HITCH, MEANS FOR SENSING DRAFT ON AN IMPLEMENT ATTACHED TO THE HITCH, A VALVE FOR CONTROLLING PASSAGE OF HYDRAULIC FLUID TO AND FROM SAID LIFT CYLINDER RESPONSIVE TO SENSED DRAFT ON THE IMPLEMENT TO MAINTAIN A MORE OR LESS UNIFORM DRAFT, A CONTROL LEVER FOR OPERATING THE VALVE TO RAISE AND LOWER THE HITCH TO MOVE THE IMPLEMENT BETWEEN OPERATING AND NON-OPERATING POSITION, A FLOW CONTROL VALVE INTERPOSED BETWEEN THE PUMP AND THE CYLINDER AND MANUALLY ADJUSTABLE FOR SUPPLYING FLUID TO THE CYLINDER AT A MAXIMUM RATE OF FLOW AND AT SELECTED RATES BELOW SAID MAXIMUM RATE, AND A MECHANICAL LINKAGE LOCATED IN THE PATH OF MOVEMENT OF THE CONTROL LEVER AND CONNECTED WITH THE FLOW CONTROL VALVE, SAID LINKAGE BEING INDEPENDENT OF THE DRAFT SENSING MEANS AND ENGAGED AND ACTUATED SOLELY BY MOVEMENT OF THE CONTROL LEVER TO RAISE THE IMPLEMENT TO NONOPERATING POSITION, AND ACTUATION OF SAID LINKAGE MOVING THE FLOW CONTROL VALVE TO PROVIDE MAXIMUM RATE OF FLOW.
References Cited (Backward Citations)
US3003568A
Cited
US2102865A
Cited
US2679199A
Cited
US2611306A
Cited
US2714346A
Cited
US2804814A
Cited
US2851938A
Cited
US3013617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |