Patents by Inventor Tokuji Yatsui

Tokuji Yatsui 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).

  • Motor operated valve
    Patent number: 6561480
    Abstract: The present invention provides a motor-operated valve having no additional stopper for stopping the rotation of a rotor at fully open and closed states of the valve to allow a reduced number of parts of the valve and to prevent a noise otherwise generated by the abutment of the rotor against a stopper. The motor-operated valve includes a rotor 17 having a shaft 18 formed with an external thread 20. The motor-operated valve also includes a needle valve element 6 having a needle valve head 5 at one end portion thereof and an internal thread 16 engaging with the external thread 20 at another end portion. The valve element has a joining portion 14 for joining the valve head to the internal thread 20. The motor-operated valve also includes a main valve body 1 having a guide portion which stops the rotation of the valve element but allows the axial movement of the valve element.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: May 13, 2003
    Assignee: Kabushiki Kaisha Saginomiya Seisakusho
    Inventors: Yasuo Komiya, Seiichi Nakano, Hideki Sekiguchi, Tokuji Yatsui