US3621737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil pressure control system for fluid type transmission system
Assignee: Toyota Motor Corp
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Filing: 1969-07-28
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Granted: 1971-11-23
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Expires: 1989-07-28
Abstract
Abstract THIS INVENTION PROVIDES AN OIL PRESSURE CONTROL SYSTEM USES FOR FLUID TYPE TRANSMISSION CONSISTING OF A TORQUE CONVERTER AND A SPEED CHANGE GEAR PROVIDED WITH SERVO MECHANISMS. OVER THE BROAD RANGE OF THE SERVO MECHANISM, NOT ONLY THE OIL PRESSURE CONTROLLED BY OIL PRESSURE CONTROL VALVE BUT ALSO THE OIL PRESSURE CORRESPONDING TO THE ENGINE THROTTLE VALVE OPENING OR VACUUM PRESSURE OF THE INTAKE MANIFOLD IS SUPPLIED BY SEPARATE CIRCUIT TO THE SERVO MECHANISM, SO AS TO CONTROL THE OIL PRESSURE CONTROL VALVE IN ACCORDANCE WITH THE VEHICLE SPEED FOR RELIEVING THE IMPACT AT THE AUTOMATIC SHIFT WITH THE AID OF APPROPRIATE SERVO CAPACITY.
Inventors
- 👤 Sumio Uozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:20
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08
Claims Analysis
Total Claims: 0
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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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |