Patents by Inventor Tomoyuki Fukuoka

Tomoyuki Fukuoka 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).

  • Power source for re-circulation pump and method of controlling the same
    Patent number: 7218068
    Abstract: A variable-voltage variable-frequency power source for an electric motor that drives a re-circulation pump for a boiling water nuclear reactor. The power source has a semiconductor electric power converter and a speed controller for controlling the semiconductor electric power converter. When a part of the semiconductor electric power converter comes into an inoperative state, that part is electrically disconnected, and the variable-voltage variable-frequency power source temporarily stops outputting power, thereby idling the re-circulation pump. Thereafter, the power source re-starts outputting power before the re-circulation pump completely stops. Thus, the re-circulation pump keeps operating, without stopping.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: May 15, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Tomoyuki Fukuoka
  • Power source for re-circulation pump and method of controlling the same
    Publication number: 20060120501
    Abstract: A variable-voltage variable-frequency power source for an electric motor that drives a re-circulation pump for a boiling water nuclear reactor. The power source has a semiconductor electric power converter and a speed controller for controlling the semiconductor electric power converter. When a part of the semiconductor electric power converter comes into an inoperative state, that part is electrically disconnected, and the variable-voltage variable-frequency power source temporarily stops outputting power, thereby idling the re-circulation pump. Thereafter, the power source re-starts outputting power before the re-circulation pump completely stops. Thus, the re-circulation pump keeps operating, without stopping.
    Type: Application
    Filed: August 30, 2005
    Publication date: June 8, 2006
    Inventor: Tomoyuki Fukuoka