US3314484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor hydraulic system
Assignee: Massey Ferguson Inc
•
Filing: 1964-04-17
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Granted: 1967-04-18
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Expires: 1984-04-17
Abstract
No abstract record available.
Inventors
- 👤 Ernest V Bunting
- 👤 Hans V Lind
- 👤 Edwin J Skiba
- 👤 Glennard T Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/1117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A TRACTOR HAVING DRAFT LINKS HYDRAULICALLY LIFTED BY AN ACTUATOR AND A SOURCE OF HYDRAULIC PRESSURE FLUID, A CONTROL SYSTEM COMPRISING, A CONTROL VALVE FOR SAID FLUID PRESSURE SOURCE AND SAID ACTUATOR, SAID VALVE HAVING A SHIFTABLE ELEMENT WITH ADJACENT ALTERNATE POSITIONS FOR HYDRAULICALLY RAISING, HOLDING AND LOWERING SAID LINKS, A DRAFT CONTROL LINKAGE FOR SAID VALVE ELEMENT RESPONSIVE TO DRAFT LOADS ON SAID LINKS, A POSITION CONTROL LINKAGE FOR SAID VALVE ELEMENT RESPONSIVE TO THE POSITION TO WHICH SAID LINKS ARE LIFTED, A PRESSURE CONTROL LINKAGE FOR SAID VALVE ELEMENT RESPONSIVE TO THE HYDRAULIC PRESSURE IN SAID ACTUATOR, A MANUAL CONTROL LEVER, AND MEANS INCLUDING SAID LEVER FOR SELECTIVELY CLUTCHING SAID LEVER TO SAID LINKAGES BY MANIPULATING SAID LEVER.
Claim 2
Dependent Claim
121 words
IN A TRACTOR HAVING DRAFT LINKS HYDRAULICALLY LIFTED BY AN ACTUATOR AND A SOURCE OF HYDRAULIC PRESSURE FLUID, A CONTROL SYSTEM COMPRISING, A CONTROL VALVE FOR SAID FLUID PRESSURE SOURCE AND SAID ACTUATOR, SAID VALVE HAVING A SHIFTABLE ELEMENT WITH ADJACENT ALTERNATE POSITIONS FOR HYDRAULICALLY RAISING, HOLDING AND LOWERING SAID LINKS, A DRAFT CONTROL LINKAGE FOR SAID VALVE ELEMENT RESPONSIVE TO DRAFT LOADS ON SAID LINKS, A POSITION CONTROL LINKAGE FOR SAID VALVE ELEMENT RESPONSIVE TO THE POSITION TO WHICH SAID LINKS ARE LIFTED, A PRESSURE CONTROL LINKAGE FOR SAID VALVE ELEMENT RESPONSIVE TO THE HYDRAULIC PRESSURE IN SAID ACTUATOR, A MANUAL CONTROL LEVER, AND MEANS INCLUDING SAID LEVER FOR SELECTIVELY CLUTCHING SAID LEVER TO SAID LINKAGES BY MANIPULATING SAID LEVER.
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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) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |