Patents by Inventor Hee W. Park

Hee W. Park 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 system for excavations with an improved flow control valve
    Patent number: 5609088
    Abstract: A hydraulic control system for excavators includes a variable displacement pump for producing a variable volume of pressurized working fluid, a hydraulic swing motor rotatably driven by the working fluid and a flow control valve operable to control flow of the working fluid with respect to the swing motor. The first flow control valve comprises a valve body and a valve spool slidably fitted into the valve body for selective shifting movement between a first operative position, a second operative position and a neutral position.
    Type: Grant
    Filed: July 25, 1995
    Date of Patent: March 11, 1997
    Assignee: Daewoo Heavy Industries, Ltd.
    Inventor: Hee W. Park
  • Engine ignition cable for preventing unwanted interference due to high frequency noise
    Patent number: 4998090
    Abstract: An engine ignition cable in which carbon fiber is mixed with conductive rubber or synthetic resin, to provide a conductive portion in which the resistance value is readily adjusted. The conductive element of the cable is made of carbon fiber of polyacrylo nitrile type. The conductive element is coated with an electro-conductive layer comprising a mixture of polyacrylo nitrile type carbon fiber powder and conductive rubber or synthetic resin mixed in accordance with a predetermined ratio to achieve a predetermined resistance value.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: March 5, 1991
    Inventor: Hee W. Park