Patent US3142915A successfully refreshed from Google Patents.
US3142915A
Expired / Lapsed
US
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Automatic level control system for construction machines
Assignee: GURRIES Manufacturing CO
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Filing: 1962-05-11
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Granted: 1964-08-04
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Expires: 1982-05-11
Abstract
No abstract record available.
Inventors
- 👤 Curlett John
- 👤 Raymond A Gurries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/841
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A ROAD BUILDING MACHINE WHICH INCLUDES A SURFACE WORKING IMPLEMENT, GROUND ENGAGING SUPPORTING TRACTION MEANS, HYDRAULIC RAMS MOUNTED ON THE MACHINE TO RELATIVELY RAISE AND LOWER THE TRACTION MEANS, AND FEED AND RETURN LINES CONNECTED TO THE RAMS; A LEVEL CONTROL DEVICE COMPRISING A VERTICAL SLEEVE, MEANS MOUNTING THE SLEEVE ON THE MACHINE AT ONE SIDE THEREOF, A TUBULAR STEM SLIDABLE IN THE SLEEVE AND PROJECTING AT BOTH ENDS THEREFROM, A VALVE MOUNTED ON THE UPPER END OF THE STEM AND INTERPOSED IN SAID FEED AND RETURN LINES, A GAUGE WHEEL SUPPORTED FROM THE STEM AT ITS LOWER END, A CONNECTION BETWEEN THE WHEEL AND VALVE TO ACTUATE THE LATTER UPON
Claim 2
Dependent Claim
112 words
IN A ROAD BUILDING MACHINE WHICH INCLUDES A SURFACE WORKING IMPLEMENT, GROUND ENGAGING SUPPORTING TRACTION MEANS, HYDRAULIC RAMS MOUNTED ON THE MACHINE TO RELATIVELY RAISE AND LOWER THE TRACTION MEANS, AND FEED AND RETURN LINES CONNECTED TO THE RAMS; A LEVEL CONTROL DEVICE COMPRISING A VERTICAL SLEEVE, MEANS MOUNTING THE SLEEVE ON THE MACHINE AT ONE SIDE THEREOF, A TUBULAR STEM SLIDABLE IN THE SLEEVE AND PROJECTING AT BOTH ENDS THEREFROM, A VALVE MOUNTED ON THE UPPER END OF THE STEM AND INTERPOSED IN SAID FEED AND RETURN LINES, A GAUGE WHEEL SUPPORTED FROM THE STEM AT ITS LOWER END, A CONNECTION BETWEEN THE WHEEL AND VALVE TO ACTUATE THE LATTER UPON
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |