US3217826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic wheel slip control
Assignee: Caterpillar Inc
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Filing: 1964-12-17
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Granted: 1965-11-16
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Expires: 1984-12-17
Abstract
No abstract record available.
Inventors
- 👤 John W Carter
- 👤 Gordon W Johnson
- 👤 Robert N Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/64; E02F3/65; E02F3/651; E02F3/6454; E02F9/00; E02F9/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
191 words
IN A HYDRAULIC SLIP CONTROL FOR A TRACTOR DRAWN SCRAPER WHEREIN THE TRACTOR HAS A PAIR OF POWER DRIVEN WHEELS AND THE SCRAPER HAS A PAIR OF POWER DRIVEN WHEELS THE COMBINATION COMPRISING: A FIRST HYDRAULIC PUMP MECHANICALLY ASSOCIATED WITH THE TRACTOR AND DRIVEN AT A SPEED PROPORTIONAL TO THE SPEED AT WHICH THE WHEELS OF THE TRACTOR ARE DRIVEN; A SECOND HYDRAULIC PUMP MECHANICALLY ASSOCIATED WITH THE SCRAPER AND DRIVEN AT A SPEED PROPORTIONAL TO THE SPEED OF THE SCRAPER WHEELS; MEANS COMMUNICATING THE OUTPUT OF SAID SECOND PUMP WITH THE INPUT OF SAID FIRST PUMP WHEREBY THE PRESSURE AT THE OUTPUT OF SAID SECOND PUMP IS RELATIVELY CONSTANT WHEN THE TRACTOR DRAWN SCRAPER IS MOVING AND NEITHER SET OF WHEELS IS SLIPPING; MEANS ASSOCIATED WITH THE SCRAPER AND OPERABLE TO REGULATE THE SPEED AT WHICH THE SCRAPER WHEELS ARE DRIVEN; AND MEANS ASSOCIATED WITH SAID SECOND PUMP AND SAID WHEEL SPEED REGULATING MEANS AND RESPONSIVE TO A RISE IN PRESSURE AT THE OUTPUT OF THE SECOND PUMP DUE TO THE SCRAPPER WHEELS SLIPING TO CAUSE SAID REGULATING MEANS TO REDUCE THE SPEED AT WHICH THE SCRAPER WHEELS ARE DRIVEN.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |