Patents by Inventor Kenichi Koshi

Kenichi Koshi 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: 4706932
    Abstract: A fluid control valve apparatus comprises logic valve means including a valve housing, a first valve member defined in the valve housing, and an axially movable valve body arranged in the first valve chamber, with the valve body including opposite end portions and a conical surface portion brought into contact with the conical surface portion when the valve body is moved in a valve closing direction. First and second hydraulic fluid chambers are defined in the valve housing and communicate with each other when the conical surface portion is out of contact with the valve seat and out of communication when the conical surface portion contacts the valve seat. A first pilot chamber in the valve housing, adjacent one end portion of the valve body, biases the valve body in a closing direction by a first pilot pressure signal.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: November 17, 1987
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kunihiko Yoshida, Kenichi Koshi, Nobuhiko Ichiki