US3360052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power lift system for tractors
Assignee: Allis Chalmers Corp
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Filing: 1964-12-07
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Granted: 1967-12-26
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Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 Roy W Johansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:25
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/114; A01B63/1145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
A HYDRAULIC SYSTEM COMPRISING A RESERVOIR, LOW VOLUME AND HIGH VOLUME PUMPING MEANS CONNECTED AT THEIR INTAKE SIDES WITH SAID RESERVOIR, PRIMARY FLUID PASSAGE MEANS HAVING AN INLET CONNECTED TO THE DELIVERY SIDE OF SAID LOW VOLUME PUMPING MEANS, SECONDARY FLUID PASSAGE MEANS HAVING AN INLET CONNECTED TO THE DELIVERY SIDE OF SAID HIGH VOLUME PUMPING MEANS; A FLUID MOTOR; AND A FLUID CONTROL VALVE OPERATIVELY CONNECTED WITH SAID PRIMARY AND SECONDARY FLUID PASSAGE MEANS AND WITH SAID FLUID MOTOR FOR ENERGIZING THE LATTER SELECTIVELY BY SAID LOW VOLUME PUMPING MEANS INDEPENDENTLY OF SAID HIGH VOLUME PUMPING MEANS, BY SAID LOW VOLUME AND HIGH VOLUME PUMPING MEANS CONJOINTLY; A WEIGHT TRANSFER VALVE CONNECTED TO SAID SECONDARY PASSAGE MEANS INCLUDING A LOW RESISTANCE FLUID DUCT AND A HIGH RESISTANCE FLUID DUCT CONNECTED PARALLEL WITH EACH OTHER IN FLUID DELIVERING RELATION WITH SAID RESERVOIR, AND SAID WEIGHT TRANSFER VALVE INCLUDING A VALVE MECHANISM SELECTIVELY OPERABLE TO DIRECT THE FLUID OUTPUT OF SAID HIGH VOLUME PUMPING MEANS THROUGH SAID LOW RESISTANCE FLUID DUCT WHILE SAID FLUID MOTOR IS ENERGIZED BY SAID LOW VOLUME PUMPING MEANS, TO DIRECT THE FLUID OUTPUT OF SAID HIGH VOLUME PUMPING MEANS TO SAID HIGH RESISTANCE FLUID DUCT WHILE SAID FLUID MOTOR IS ENERGIZED CONJOINTLY BY SAID LOW VOLUME AND HIGH VOLUME PUMPING MEANS.
Claim 2
Dependent Claim
215 words
A HYDRAULIC SYSTEM COMPRISING A RESERVOIR, LOW VOLUME AND HIGH VOLUME PUMPING MEANS CONNECTED AT THEIR INTAKE SIDES WITH SAID RESERVOIR, PRIMARY FLUID PASSAGE MEANS HAVING AN INLET CONNECTED TO THE DELIVERY SIDE OF SAID LOW VOLUME PUMPING MEANS, SECONDARY FLUID PASSAGE MEANS HAVING AN INLET CONNECTED TO THE DELIVERY SIDE OF SAID HIGH VOLUME PUMPING MEANS; A FLUID MOTOR; AND A FLUID CONTROL VALVE OPERATIVELY CONNECTED WITH SAID PRIMARY AND SECONDARY FLUID PASSAGE MEANS AND WITH SAID FLUID MOTOR FOR ENERGIZING THE LATTER SELECTIVELY BY SAID LOW VOLUME PUMPING MEANS INDEPENDENTLY OF SAID HIGH VOLUME PUMPING MEANS, BY SAID LOW VOLUME AND HIGH VOLUME PUMPING MEANS CONJOINTLY; A WEIGHT TRANSFER VALVE CONNECTED TO SAID SECONDARY PASSAGE MEANS INCLUDING A LOW RESISTANCE FLUID DUCT AND A HIGH RESISTANCE FLUID DUCT CONNECTED PARALLEL WITH EACH OTHER IN FLUID DELIVERING RELATION WITH SAID RESERVOIR, AND SAID WEIGHT TRANSFER VALVE INCLUDING A VALVE MECHANISM SELECTIVELY OPERABLE TO DIRECT THE FLUID OUTPUT OF SAID HIGH VOLUME PUMPING MEANS THROUGH SAID LOW RESISTANCE FLUID DUCT WHILE SAID FLUID MOTOR IS ENERGIZED BY SAID LOW VOLUME PUMPING MEANS, TO DIRECT THE FLUID OUTPUT OF SAID HIGH VOLUME PUMPING MEANS TO SAID HIGH RESISTANCE FLUID DUCT WHILE SAID FLUID MOTOR IS ENERGIZED CONJOINTLY BY SAID LOW VOLUME AND HIGH VOLUME PUMPING 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) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |