Patents by Inventor Yoichi Sumi

Yoichi Sumi 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 system
    Patent number: 4723753
    Abstract: A flow rate control valve system in which a valve plug is linearly driven against a valve seat by a stepping motor. The valve plug is fixed to a sleeve that has internal threads mating with external threads on the motor shaft. Splines prevent rotation of sleeve and plug. Two closely fitted cylinders are respectively supported by the motor housing and the valve plug.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: February 9, 1988
    Assignee: Mitsubishi Renki K.K.
    Inventors: Koichi Torimoto, Yoichi Sumi
  • Flow rate control valve system
    Patent number: 4723754
    Abstract: A flow rate control valve system in which a valve plug is linearly driven against a valve seat by a stepping motor. The valve plug is fixed to a sleeve that has internal threads mating with external threads on the motor shaft. Splines prevent rotation of sleeve and plug. A bearing is interposed between a smooth end of the shaft and the plug.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: February 9, 1988
    Assignee: Mitsubishi Denki K.K.
    Inventors: Koichi Torimoto, Hiroyuki Shirakawa, Yoichi Sumi