Patents by Inventor Sakae Takagi

Sakae Takagi 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).

  • Power source unit for transferring energy between power sources that power an electric vehicle
    Patent number: 6265853
    Abstract: A power source unit for use in vehicle is disclosed that effectively transfers energy between two power sources. The power source unit includes a main power source connected to input terminals of a current control circuit, such as insulation type power transfer circuit. In addition, a terminal of the main power source is connected to an output terminal of the current control circuit. The other terminal of the main power source is connected to a terminal of a parallel connection of a secondary power source and an electric power unit. The other terminal of the parallel connection is connected with a second output terminal of the current control circuit. Hence, energy from the main power source is transferred to the parallel connection of the secondary power source and electric power unit under the control of the current control circuit.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: July 24, 2001
    Assignees: Tohoku Electric Power Co., Inc., Chubu Electric Power Co., Inc., The Kansai Electric Power Co., Inc., Kyushu Electric Power Co., Inc., Tokyo R&D Co., Ltd.
    Inventors: Sakae Takagi, Hideki Mori, Shouzou Hashidume, Kiyomi Yamasaki, Nobuhito Ohnuma, Nobuyuki Kasuga