Patents by Inventor Michiro Yamazaki

Michiro Yamazaki 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).

  • Uninterruptible power supply diagnosing remaining battery capacity during normal external power source operation
    Patent number: 5148043
    Abstract: A power supply is energized by an external power source and a battery, and supplies electric power to a load. The power supply includes a battery voltage detector and a current detector for detecting a discharge current from the battery. The remaining capacity of the battery is detected in accordance with a change in the battery voltage when the external power source is free of power failure. The battery voltage change is defined as the difference between an initial voltage of the battery and an active voltage of the battery obtained when the battery is discharged by the detected discharge current for a predetermined period of time.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: September 15, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akio Hirata, Yoshiaki Miyazawa, Michiro Yamazaki