Patents by Inventor Hitoshi Takeoka

Hitoshi Takeoka 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 unit having a plurality of rechargeable battery cells and method of charging the same
    Patent number: 6121752
    Abstract: A battery assembly unit and a method of charging the same for applying constant current/constant voltage charging to a battery assembly in which a plurality of battery cell groups each having battery cells each being rechargeable and increasable in electromotive force as charging proceeds are connected in series. There are provided a reference charging voltage circuit for generating charging reference voltages serving as voltages referenced to electromotive force levels of the individual battery cell groups on the basis of charging voltage applied across the battery assembly and changeable with time, and comparison circuits each adapted to compare an electromotive force level across each of the plurality of battery cell groups connected in series with the charging reference voltage.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: September 19, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Jun Kitahara, Masato Ishii, Kenichi Saitou, Junichi Miyata, Hitoshi Takeoka