Patents by Inventor Takaaki Tauchi

Takaaki Tauchi 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).

  • Method and circuit for charging battery of portable apparatus
    Patent number: 5350996
    Abstract: A battery-power portable apparatus includes a first constant current source supplies a low current to a battery when the battery voltage is initially lower than a reference level, and when the reference level is reached a second constant current source takes over to supply a high charging current. The battery voltage is constantly monitored to detect a peak voltage and a subsequent voltage drop. When the battery voltage drops a predetermined amount from the peak voltage, the second constant current source is disabled, and the first constant current source is rendered active to charge the battery with a low current on an intermittent mode.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: September 27, 1994
    Assignee: NEC Corporation
    Inventor: Takaaki Tauchi