Patents by Inventor Shunji Asao

Shunji Asao 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).

  • Automatic implement position control system
    Patent number: 4934463
    Abstract: It takes high skill to achieve maximum efficiency of construction equipment under the ever changing working conditions. The automatic implement control system helps maximize operator efficiency and convenience by allowing a predetermined angle, lift and/or tilt position of a work implement (40) to be stored in the memory of the controller (3). In operation, the implement (40) may be moved from that stored predetermined position to perform other functions. In an automatic mode, the controller (3) can return the implement (40) to that predetermined position at any time during the work cycle. A valve (15-70) is provided for selectively switching between manual and automatic modes.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: June 19, 1990
    Assignee: Caterpillar Inc.
    Inventors: Shuji Ishida, Shoji Tozawa, Shunji Asao, Masashi Musha, Kenichi Yamamoto, Kazuhiko Eigetsu, Kyoichi Oguri, Izuru Morita, Yasunori Matsunaga, Naoto Kozuki, Shinichi Amemiya
  • Flow control valve
    Patent number: 4598730
    Abstract: A flow control valve comprising spool means and overload relief valve means built in the spool means. A filter is disposed on the upstream side of the relief valve means. When a hydraulic oil is passed through the filter, foreign materials are removed from the oil and the pulsation of the oil is inhibited or eliminated.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: July 8, 1986
    Assignee: Caterpillar Mitsubishi Ltd.
    Inventors: Akira Nakamura, Shunji Asao, Yoshiyuki Ito