Patents by Inventor Yurio Eki

Yurio Eki 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).

  • Electro-hydraulic governor employing duplex digital controller system
    Patent number: 4153198
    Abstract: An electro-hydraulic governer employing a duplex digital controller system for the optimum speed control of a steam turbine running with increasing speed in the starting stage or under load. Each of the digital controllers is operable with both a control mode and a stand-by mode, and when one of the digital controllers is placed in the control mode for controlling the rotating speed of the turbine, the other is placed in the stand-by mode to prepare for possible failure of the controller operating with the control mode. A failure detecting unit detects failure of the digital controller operating with the control mode. An output switching unit disconnects the faulty digital controller from the control system and switches over the operating mode of the stand-by digital controller from the stand-by mode to the control mode for the continuous control of the rotating speed of the turbine.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: May 8, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Yurio Eki, Yasuhiro Tennichi, Naganobu Honda