Patent US3136371A successfully refreshed from Google Patents.
US3136371A
Expired / Lapsed
US
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Tractor arrangement
Assignee: Porsche Diesel Motorenbau GmbH
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Filing: 1960-08-26
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Granted: 1964-06-09
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Expires: 1980-08-26
Abstract
No abstract record available.
Inventors
- 👤 Rau Christian Alfons
- 👤 Frank Hans
- 👤 Bayer Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:12
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/114
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
AN INSTALLATION FOR THE AUTOMATIC DEPTH CONTROL OF WORKING IMPLEMENTS OPERATIVELY CONNECTED WITH A TRACTOR BY MEANS OF A FOUR-CORNED GUIDE LINKAGE, COMPRISING HYDRAULIC MEANS IN SAID TRACTOR INCLUDING LIFTER MEANS ADAPTED TO RAISE AND LOWER THE ATTACHED IMPLEMENT AND CONTROL VALVE MEANS FOR CONTROLLING SAID LIFTER MEANS, SAID GUIDE LINKAGE HAVING A PLURALITY OF GUIDE MEANS INCLUDING LOWER GUIDE MEANS PROVIDED WITH A PIVOT AXIS, A BOWSHAPED MEMBER PIVOTALLY SUPPORTED BY SAID TRACTOR ON AN AXIS COINCIDENT WITH SAID PIVOT AXIS, A SENSING DEVICE SUPPORTED ON SAID BOW-SHAPED MEMBER, ADJUSTING MEANS OPERATIVELY CONNECTED WITH ONE OF SAID LOWER GUIDE MEANS AND WITH SAID SENSING DEVICE, SAID ADJUSTING MEANS BEING OPERATIVELY CONNECTED WITH SAID CONTROL VALVE MEANS AND BEING EFFECTIVE TO TRANSMIT A CONTROLLING MOVEMENT TO SAID CONTROL VALVE MEANS FOR MAINTAINING THE WORKING DEPTH OF SAID IMPLEMENT IN RESPONSE TO RELATIVE MOVEMENT BETWEEN SAID ONE OF SAID GUIDE MEANS AND SAID SENSING MEANS, SAID RELATIVE MOVEMENT REPRESENTING MEASURED MAGNITUDE OF SAID WORKING DEPTH.
Claim 2
Dependent Claim
164 words
AN INSTALLATION FOR THE AUTOMATIC DEPTH CONTROL OF WORKING IMPLEMENTS OPERATIVELY CONNECTED WITH A TRACTOR BY MEANS OF A FOUR-CORNED GUIDE LINKAGE, COMPRISING HYDRAULIC MEANS IN SAID TRACTOR INCLUDING LIFTER MEANS ADAPTED TO RAISE AND LOWER THE ATTACHED IMPLEMENT AND CONTROL VALVE MEANS FOR CONTROLLING SAID LIFTER MEANS, SAID GUIDE LINKAGE HAVING A PLURALITY OF GUIDE MEANS INCLUDING LOWER GUIDE MEANS PROVIDED WITH A PIVOT AXIS, A BOWSHAPED MEMBER PIVOTALLY SUPPORTED BY SAID TRACTOR ON AN AXIS COINCIDENT WITH SAID PIVOT AXIS, A SENSING DEVICE SUPPORTED ON SAID BOW-SHAPED MEMBER, ADJUSTING MEANS OPERATIVELY CONNECTED WITH ONE OF SAID LOWER GUIDE MEANS AND WITH SAID SENSING DEVICE, SAID ADJUSTING MEANS BEING OPERATIVELY CONNECTED WITH SAID CONTROL VALVE MEANS AND BEING EFFECTIVE TO TRANSMIT A CONTROLLING MOVEMENT TO SAID CONTROL VALVE MEANS FOR MAINTAINING THE WORKING DEPTH OF SAID IMPLEMENT IN RESPONSE TO RELATIVE MOVEMENT BETWEEN SAID ONE OF SAID GUIDE MEANS AND SAID SENSING MEANS, SAID RELATIVE MOVEMENT REPRESENTING MEASURED MAGNITUDE OF SAID WORKING DEPTH.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |