US3563109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two range steering and speed gontrol mechanism for a dual hydraulic transmission separately driving two wheels of a tractor
Assignee: Unisys Corp
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Filing: 1969-04-14
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Granted: 1971-02-16
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Expires: 1989-04-14
Abstract
Abstract A TRACTOR HAS TWO SPACED FRONT WHEELS AND A TRAILING TAIL WHEEL AND HAS AN OPERATING LEVER CONTROLLING TWO SETS OF HYDRAULIC PUMPS AND MOTORS INDEPENDENTLY DRIVING A RESPECTIVE FRONT WHEEL. THE MOTORS ARE ON OPPOSITE SIDES OF THE TRACTOR AND HAVE PINTLE ARMS SET BY LEVER MEANS UNDER RESILIENT PRESSURE AGAINST STOPS IN ONE OF TWO SPEED RANGES.
Inventors
- 👤 Emmett F Glass
- 👤 Edmund O Howell
- 👤 Bruce D Schwalm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:27
CPC Classifications
B; B60; B60K; B60K7/00; B60K7/0015; B60K17/00; B60K17/04; B60K17/06; B62; B62D; B62D49/00; B62D49/06; B62D49/0657; B62D61/00; B62D61/06; B62D61/065; F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/427; B60K17/043; B60K2007/0046; B60K2007/0061; B60K2007/0092; B60L; B60L2220/00; B60L2220/40; B60L2220/46; B60Y; B60Y2200/00; B60Y2200/20; B60Y2200/22; B60Y2200/221; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20006; Y10T74/20207; Y10T74/20213
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |