Patents by Inventor Hideki Watanable

Hideki Watanable 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).

  • Battery charger with improved change stopping capability
    Patent number: 5449996
    Abstract: A battery charger includes a circuit for monitoring a battery voltage during supply of a charging current to a battery, and a circuit for stopping the supply of the charging current when the battery voltage is decreased by a predetermined value after the battery voltage has reached its maximum value. A first predetermined value is adopted as the predetermined value when an increasing tendency of the battery voltage is detected after a predetermined time has elapsed from starting of the charging operation. A second predetermined value is adopted as the predetermined value until the increase tendency of the battery voltage is monitored after the predetermined time has elapsed from starting of the charging operation. The absolute value of the first predetermined value is determined to be smaller than that of the second predetermined value.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: September 12, 1995
    Assignee: Makita Corporation
    Inventors: Toshio Matsumoto, Hideki Watanable