Patents by Inventor Katsunori Akaba

Katsunori Akaba 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).

  • Failure-free power source device
    Patent number: 5633789
    Abstract: A failure-free power source device memorizes the history of errors of a commercially available power source, monitors the stability of the power source on the basis of the history, directly outputs, when the power source remains stable for more than a predetermined period of time, an AC input as an AC output, and releases, when an error occurs in the power source, energy stored in an accumulator until a predetermined period of time expires to thereby output it as an AC output via an inverter.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: May 27, 1997
    Assignee: NEC Corporation
    Inventors: Takumi Kimura, Katsunori Akaba, Fumihiko Hiratsuka, Takaaki Sato