Patent US3331447A successfully refreshed from Google Patents.
US3331447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for raising and lowering tractor implements
Assignee: International Motors LLC
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Filing: 1964-12-09
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Granted: 1967-07-18
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Frank J Simak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:07
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/1006; A01B63/1013; E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2203; F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A TRACTOR AND IMPLEMENT ASSEMBLY INCLUDING HYDRAULIC POWER MEANS TO RAISE AND LOWER THE IMPLEMENT, SAID HYDRAULIC POWER MEANS INCLUDING A FLUID RESERVOIR, A FLUID PUMP, A CONTROL CYLINDER CONNECTED TO SAID IMPLEMENT, AND VALVE MEANS TO DIRECT THE FLOW OF FLUID BETWEEN SAID FLUID RESERVOIR AND SAID CONTROL CYLINDER, THE IMPROVEMENT COMPRISING: FLOW CONTROL MEANS IN COMMUNICATION WITH SAID VALVE MEANS AND OPERATIVELY ASSOCIATED WITH SAID HYDRAULIC POWER MEANS TO MAINTAIN A CONSTANT PREDETERMINED RATE OF FLUID FLOW TO OR FROM SAID CONTROL
Claim 2
Dependent Claim
85 words
IN A TRACTOR AND IMPLEMENT ASSEMBLY INCLUDING HYDRAULIC POWER MEANS TO RAISE AND LOWER THE IMPLEMENT, SAID HYDRAULIC POWER MEANS INCLUDING A FLUID RESERVOIR, A FLUID PUMP, A CONTROL CYLINDER CONNECTED TO SAID IMPLEMENT, AND VALVE MEANS TO DIRECT THE FLOW OF FLUID BETWEEN SAID FLUID RESERVOIR AND SAID CONTROL CYLINDER, THE IMPROVEMENT COMPRISING: FLOW CONTROL MEANS IN COMMUNICATION WITH SAID VALVE MEANS AND OPERATIVELY ASSOCIATED WITH SAID HYDRAULIC POWER MEANS TO MAINTAIN A CONSTANT PREDETERMINED RATE OF FLUID FLOW TO OR FROM SAID CONTROL
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |