Patents by Inventor Isao Watabe

Isao Watabe 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).

  • Apparatus for measuring output DC current of rectifier devices
    Patent number: 4196387
    Abstract: In apparatus for indirectly measuring the output DC current of a rectifier device on the input side of a polyphase rectifier transformer, a polyphase auxiliary current transformer is provided and the polyphase primary or secondary windings thereof are combined such that the area of the decreasing secondary current waveform is made equal to the area of the increasing secondary current waveform during commutation thereby releaving the secondary current from the adverse effect of the overlap angle.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: April 1, 1980
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Isao Watabe, Hideki Mizuno