Patents by Inventor Toshiaki Yokoyama

Toshiaki Yokoyama 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).

  • Method for starting hydraulic turbine generator
    Patent number: 4201925
    Abstract: A method for improving the starting phase of the running of a hydraulic turbine or pump turbine. According to this method, an opening of wicket gates is increased as a function of an increase in r.p.m. of a runner, so that the flow rate of water running into a runner may be maintained constant throughout acceleration and synchronizing process to the rated speed once attained said constant value at an early stage of starting.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: May 6, 1980
    Assignee: Hitachi, Ltd.
    Inventors: Takao Kuwabara, Hiroshi Okumura, Toshiaki Yokoyama