Patents by Inventor Jun Muruyama

Jun Muruyama 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).

  • Flow rate control valve device and flow force reduction structure
    Patent number: 5271430
    Abstract: A flow rate control valve device for controlling and then supplying fluid under pressure to an actuator such as an hydraulic cylinder or the like which includes a valve body having a drain port kept at a low pressure and a main spool slidably mounted in the valve body to connect or disconnect the drain port with a pressure chamber. Notch grooves are formed on an outer peripheral surface of the main spool. A spring is interposed between the valve body and the main spool to urge the spool to a valve body seat. A pushing device is provided for pushing the main spool against the resilient force of the spring.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: December 21, 1993
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Jun Muruyama, Koji Yamashita