Patents by Inventor Toshiyuki Shigeta

Toshiyuki Shigeta 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).

  • Hydraulic circuit for hydraulic machine
    Patent number: 5950426
    Abstract: A hydraulic circuit enables a plurality of hydraulic actuators to be locked or unlocked at the same time no matter whether control valves controlling pressurized oil feed to the hydraulic actuators are pilot-controlled or not. To this end, the circuit is provided with oil lines leading from hydraulic pumps to an oil reservoir without passing through the control valves and with first and second selector valves 20 and 24 opening or closing the oil lines.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: September 14, 1999
    Assignee: Shin Caterpillar Mitsubishi Ltd.
    Inventors: Izuru Morita, Ryuzo Maeda, Toshiyuki Shigeta