Patents by Inventor Kenjiro Iwasawa

Kenjiro Iwasawa 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).

  • Actuator with built-in pilot valve
    Patent number: 4809587
    Abstract: An actuator has a pilot valve incorporated in a piston thereof which is slidably disposed in a cylinder tube, the piston having first and second piston lands slidably disposed in first and second coaxial cylinder chambers. A spool valve body has first and second spool lands slidably disposed in an inner hole in the piston. When the spool valve body is moved in one direction, a first axial passage in the piston communicates with a pressure sink through a first return port which is opened by the first spool land, and a second axial passage in the piston communicates with a portion of the inner hole in front of the second spool land through a second supply port which is opened by the second spool land.
    Type: Grant
    Filed: February 17, 1988
    Date of Patent: March 7, 1989
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Eiichiro Kawahara, Kenichi Ikejiri, Takashi Iino, Kenjiro Iwasawa, Noboru Yamamoto