Patent US3155252A successfully refreshed from Google Patents.
US3155252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable valve control mechanism for tractor mounted loaders
Assignee: Caterpillar Inc
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Filing: 1963-06-07
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Granted: 1964-11-03
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Expires: 1983-06-07
Abstract
No abstract record available.
Inventors
- 👤 Donald R Muellner
- 👤 John R Muntjanoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:42
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/43; E02F3/431; E02F3/432
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN A TRACTOR MOUNTED LOADER HAVING A BUCKET SUPPORTED ON LIFT ARMS PIVOTED TO THE TRACTOR AND ADAPTED TO BE RAISED BY FLUID MOTOR MEANS, A CONTROL VALVE FOR DIRECTING FLUID TO SAID MOTOR MEANS UPON ADJUSTMENT AWAY FROM A NORMAL NEUTRAL POSITION, MEANS TO HOLD THE VALVE IN SAID POSITION OF ADJUSTMENT AND MEANS TO RELEASE THE VALVE WHEN THE BUCKET ATTAINS A PREDETERMINED HEIGHT, SAID LAST NAMED MEANS COMPRISING, A MASTER CYLINDER AND PISTON PIVOTED BETWEEN A FIXED POINT ON THE TRACTOR AND A POINT ON A LIFT ARM WHEREBY MOVEMENT OF THE LIFT ARM CREATES PRESSURE IN THE MASTER CYLINDER, A SLAVE CYLINDER HAVING A
Claim 2
Dependent Claim
108 words
IN A TRACTOR MOUNTED LOADER HAVING A BUCKET SUPPORTED ON LIFT ARMS PIVOTED TO THE TRACTOR AND ADAPTED TO BE RAISED BY FLUID MOTOR MEANS, A CONTROL VALVE FOR DIRECTING FLUID TO SAID MOTOR MEANS UPON ADJUSTMENT AWAY FROM A NORMAL NEUTRAL POSITION, MEANS TO HOLD THE VALVE IN SAID POSITION OF ADJUSTMENT AND MEANS TO RELEASE THE VALVE WHEN THE BUCKET ATTAINS A PREDETERMINED HEIGHT, SAID LAST NAMED MEANS COMPRISING, A MASTER CYLINDER AND PISTON PIVOTED BETWEEN A FIXED POINT ON THE TRACTOR AND A POINT ON A LIFT ARM WHEREBY MOVEMENT OF THE LIFT ARM CREATES PRESSURE IN THE MASTER CYLINDER, A SLAVE CYLINDER HAVING A
References Cited (Backward Citations)
US3122247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |