Patents by Inventor Shinji Okayama

Shinji Okayama 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 control system for electric vehicle
    Patent number: 5931245
    Abstract: A battery control system for an electric vehicle 1 which includes a propelling motor (7) and an electric power unit(10)for driving the motor comprises a plurality of discrete batteries (13a) to (13d) connected in series and outputting a predetermined motor voltage, a plurality of selection switches (25a) to (25h) which are provided corresponding in number to the discrete batteries(13a)to (13d) and selectively connect one of the discrete batteries (13a) to (13d) in parallel to a control circuit (16), a judging device (23) which determines a state of electric energy possessed by each of the discrete batteries (13a) to (13d) and a control device (23) which selects one of the discrete batteries(13a) to (13h) having a maximum energy based on the state of electric energy as determined by the judging device and activates one of the corresponding selection switches (25a) to (25h) accordingly, and a control stabilization circuit (24) provided between the selection switches (25a) to (25h) and the control circuit (16) t
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: August 3, 1999
    Assignees: Seiko Epson Corporation, Tokyo R & D Co., Ltd.
    Inventors: Akihito Uetake, Issei Yamakoshi, Kunihiko Takagi, Takeshi Seto, Haruki Torizuka, Tamotsu Fukazawa, Shinji Okayama