Patents by Inventor Eiji Mitsugi

Eiji Mitsugi 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).

  • Control circuit for proportional electro-hydraulic fluid control valves
    Patent number: 4724865
    Abstract: A control circuit for a proportional electro-hydraulic fluid control valve in which during a transient condition with a feedback control signal varying rapidly the control loop is changed to an open loop to change the transient characteristic of the valve to prevent the occurrence of an abnormal surge. The control circuit includes a control loop changeover circuit designed so that when the error signal is greater than a predetermined level, the control mode of the magnitude control of a control output signal is changed from a closed loop control in accordance with the feedback signal to an open loop control in accordance with an input signal.
    Type: Grant
    Filed: March 18, 1987
    Date of Patent: February 16, 1988
    Assignee: Yuken Kogyo Kabushiki Kaisha
    Inventors: Kenichi Hirano, Yasuyuki Shingu, Eiji Mitsugi