Patents by Inventor Keiji Ushiro

Keiji Ushiro 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).

  • Patent number: 4476890
    Abstract: A pressure control valve includes a relief poppet biased by a first spring into contact with a seat and an anti-void poppet biased by a second spring into contact with a seat independently of the relief poppet, so that a sharp response of the valve is ensured for a void control or anti-void function and the interference of the anti-void function with a relief function is prevented. Part of the check poppet which faces a relief passageway is formed with a shoulder to direct an outlet portion of a pilot passageway parallel to the axis of the relief passageway, thereby eliminating high frequency vibration of the pilot poppet or generation of noise due to the interference of pilot and main flows of fluid.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: October 16, 1984
    Assignee: Kayaba Kogyo Kabushiki Kaisha
    Inventors: Haruhiko Kawasaki, Keiji Ushiro