Patent GB540685A successfully refreshed from Google Patents.
US3313354A
Expired / Lapsed
US
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Apparatus for automatically controlling the depth of soil tilled by agricultural tractors
Assignee: TADAO YAMAOKA
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Filing: 1964-11-04
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Granted: 1967-04-11
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Expires: 1984-11-04
Abstract
No abstract record available.
Inventors
- 👤 Jin Kokichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:57
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/112
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN AN AGRICULTURAL TRACTOR PROVIDED WITH A ROTARY IMPLEMENT DRIVEN BY THE POWER TRANSMITTED FROM THE TRACTOR ENGINE THROUGH A POWER TAKE-OFF SHAFT, AND HYDRAULICALLY OPERATED MEANS FOR CAUSING VERTICAL MOVEMENT OF SAID ROTARY IMPLEMENT, APPARATUS FOR AUTOMATICALLY CONTROLLING THE DEPTH OF SOIL BEING TILLED BY SAID TRACTOR, COMPRISING CONTROLLER MEANS DISPOSED IN THE POWER TRANSMISSION PATH FROM THE TRACTOR ENGINE TO SAID ROTARY IMPLEMENT AND OPERATIVE IN RESPONSE TO ANY VARIATION OF THE LOAD APPLIED TO THE POWER TAKE-OFF SHAFT, CONTROL VALVE MEANS FOR CONTROLLING THE OPERATION OF SAID HYDRAULICALLY OPERATED MEANS, AND MEANS TO TRANSMIT THE OPERATION OF SAID CONTROLLER MEANS TO SAID CONTROL VALVE MEANS.
Claim 2
Dependent Claim
108 words
IN AN AGRICULTURAL TRACTOR PROVIDED WITH A ROTARY IMPLEMENT DRIVEN BY THE POWER TRANSMITTED FROM THE TRACTOR ENGINE THROUGH A POWER TAKE-OFF SHAFT, AND HYDRAULICALLY OPERATED MEANS FOR CAUSING VERTICAL MOVEMENT OF SAID ROTARY IMPLEMENT, APPARATUS FOR AUTOMATICALLY CONTROLLING THE DEPTH OF SOIL BEING TILLED BY SAID TRACTOR, COMPRISING CONTROLLER MEANS DISPOSED IN THE POWER TRANSMISSION PATH FROM THE TRACTOR ENGINE TO SAID ROTARY IMPLEMENT AND OPERATIVE IN RESPONSE TO ANY VARIATION OF THE LOAD APPLIED TO THE POWER TAKE-OFF SHAFT, CONTROL VALVE MEANS FOR CONTROLLING THE OPERATION OF SAID HYDRAULICALLY OPERATED MEANS, AND MEANS TO TRANSMIT THE OPERATION OF SAID CONTROLLER MEANS TO SAID CONTROL VALVE MEANS.
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |