Patents by Inventor Pyung Hwan Yoo

Pyung Hwan Yoo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydraulic control systems for an automatic transmission
    Patent number: 6027427
    Abstract: A hydraulic control system for an automatic transmission includes a pressure regulator for regulating hydraulic pressure produced in an oil pump, and a plurality of valves selectively supplying the regulated hydraulic pressure to a first number of friction elements. A second number of solenoid valves controls operation of the first number of friction elements by controlling supply of the regulated hydraulic pressure to the plurality of valves; wherein the second number is less than the first number. A manual valve controls supply of the regulated pressure to the second number of solenoid valves.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: February 22, 2000
    Assignee: Hyundai Motor Co.
    Inventor: Pyung Hwan Yoo