Patents by Inventor Koji Ishizawa

Koji Ishizawa 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).

  • Contactless power transmitting device
    Patent number: 7109682
    Abstract: A contactless power transmitting device is provided including a power transmitting device functioning as a charger, a power transmitting-receiving sharing device functioning as a charger and including a secondary battery, and a power receiving device including a secondary battery. The power transmitting-receiving sharing device is used as a power supply for portable computers. The power receiving device is used as a power supply for cellular phones. The power transmitting device forms a contactless power transmitting device respectively by electromagnetically coupling to either the power transmitting-receiving sharing device or the power receiving device to charge the secondary battery or the secondary battery. The power transmitting-receiving sharing device forms the contactless power transmitting device by electromagnetically coupling to the power receiving device. In this case, the power transmitting-receiving sharing device charges the secondary battery included in the power receiving device.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: September 19, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Tsutomu Takagi, Koji Ishizawa
  • Contactless power transmitting device
    Publication number: 20050134213
    Abstract: A contactless power transmitting device is provided including a power transmitting device functioning as a charger, a power transmitting-receiving sharing device functioning as a charger and including a secondary battery, and a power receiving device including a secondary battery. The power transmitting-receiving sharing device is used as a power supply for portable computers. The power receiving device is used as a power supply for cellular phones. The power transmitting device forms a contactless power transmitting device respectively by electromagnetically coupling to either the power transmitting-receiving sharing device or the power receiving device to charge the secondary battery or the secondary battery. The power transmitting-receiving sharing device forms the contactless power transmitting device by electromagnetically coupling to the power receiving device. In this case, the power transmitting-receiving sharing device charges the secondary battery included in the power receiving device.
    Type: Application
    Filed: November 4, 2004
    Publication date: June 23, 2005
    Inventors: Tsutomu Takagi, Koji Ishizawa