Patent US3225618A successfully refreshed from Google Patents.
US3225618A
Expired / Lapsed
US
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Hydrostatic power transmission systems
Assignee: Austin Motor Co Ltd
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Filing: 1962-07-31
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Granted: 1965-12-28
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Expires: 1982-07-31
Abstract
No abstract record available.
Inventors
- 👤 Graham D Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:51
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/462; F16H59/00; F16H59/36; F16H2059/366; F16H59/14; Y; Y10; Y10S; Y10S74/00; Y10S74/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN COMBINATION, A VARIABLE RATIO HYDROSTATIC POWER TRANSMISSION SYSTEM FOR A MOTOR VEHICLE, SAID MOTOR VEHICLE HAVING A THROTTLE-CONTROLLED ENGINE AND SAID TRANSMISSION HAVING A HYDRAULIC CONTROL CIRCUIT, A SPEED-RATIOSELECTION VALVE IN THE HYDRAULIC CIRCCUIT, A GOVERNOR FOR CONTROLLING SAID VALVE ION RESPONSE TO VARIATIONS IN ENGINE SPEED, AND MEANS FOR OPPOSING THE CONTROLLING FORCE OF THE GOVERNOR IN THE EQUILIBRIUM POSITION OF THE VALVE COMPRISING A CONNECTION BETWEEN THE VALVE AND ENGINE THROTTLE AND A CONNECTION BETWEEN THE VALVE AND THE POWER TRANSMISSION, THE SPEED-RATIO-SELECTION VALVE BEING A SPOOL-TYPE PISTON-VALVE WHICH CONTROLS A PAIR OF EXHAUST PORTS DISPOSED AT OPPOSITE SIDES OF A PORT WHICH IS CONNECTED TO A FEED OF HIGH-PRESSURE FLUID; THE EXHAUST PORTS COMMUNICATING WITH OPPOSITE ENDS RESPECTIVELY OF A SERVOCYLINDER THE PISTON OF WHICH IS ARRANGED TO OPERATE MEANS BY WHICH THE SPEED RATIO OF THE TRANSMISSION SYSTEM IS CHANGED.
Claim 2
Dependent Claim
145 words
IN COMBINATION, A VARIABLE RATIO HYDROSTATIC POWER TRANSMISSION SYSTEM FOR A MOTOR VEHICLE, SAID MOTOR VEHICLE HAVING A THROTTLE-CONTROLLED ENGINE AND SAID TRANSMISSION HAVING A HYDRAULIC CONTROL CIRCUIT, A SPEED-RATIOSELECTION VALVE IN THE HYDRAULIC CIRCCUIT, A GOVERNOR FOR CONTROLLING SAID VALVE ION RESPONSE TO VARIATIONS IN ENGINE SPEED, AND MEANS FOR OPPOSING THE CONTROLLING FORCE OF THE GOVERNOR IN THE EQUILIBRIUM POSITION OF THE VALVE COMPRISING A CONNECTION BETWEEN THE VALVE AND ENGINE THROTTLE AND A CONNECTION BETWEEN THE VALVE AND THE POWER TRANSMISSION, THE SPEED-RATIO-SELECTION VALVE BEING A SPOOL-TYPE PISTON-VALVE WHICH CONTROLS A PAIR OF EXHAUST PORTS DISPOSED AT OPPOSITE SIDES OF A PORT WHICH IS CONNECTED TO A FEED OF HIGH-PRESSURE FLUID; THE EXHAUST PORTS COMMUNICATING WITH OPPOSITE ENDS RESPECTIVELY OF A SERVOCYLINDER THE PISTON OF WHICH IS ARRANGED TO OPERATE MEANS BY WHICH THE SPEED RATIO OF THE TRANSMISSION SYSTEM IS CHANGED.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |