Patents by Inventor Phil Coldwell

Phil Coldwell 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).

  • Control system and control method for uninterruptible power supply
    Patent number: 5781448
    Abstract: Amount of alternating current power is calculated using measuring units for alternating current voltage and alternating current. Value of direct current is calculated using the calculated alternating current power and an efficiency table. An initial life time of a battery is predicted using the calculated direct current value and a battery life time table. Life time corresponding to an actual consumed amount is repeatedly updated using a detected direct current value and an updated life time.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: July 14, 1998
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Apricot Computers Limited
    Inventors: Yoichi Nakamura, Takashi Saito, Phil Coldwell, Nigel Hart