Patents by Inventor Yasushi Kawahata

Yasushi Kawahata 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).

  • Image forming apparatus and method
    Patent number: 6144831
    Abstract: An image forming apparatus includes: a transfer unit T2 including the inside transfer roll 29, the outside transfer roll 30 transfers the toner image from the toner image holding belt B onto the recording sheet that passes through the transfer region Q4 when transfer voltage is applied to between the inside transfer roll 29 and the outside transfer roll 30; electric-field adjusting conductive member 51 disposed in proximity to and along the inner side of the toner image holding belt B leaving the transfer region Q4 at a position located downstream of the transfer region Q4; and electric-field adjust-potential applying means 53; 54 applies a potential, which weakens an electric field developed between the outside transfer roll 30 and the inside transfer roll 29 in a region located downstream of the transfer region Q4, to the electric-field adjusting conductive member 51.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: November 7, 2000
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsuya Takenouchi, Yasushi Kawahata, Nobuyoshi Komatsu, Keiji Yamamoto, Noriaki Kojima, Yukio Hayashi, Takashi Kawabata, Nobuo Hyakutake, Makoto Katayama, Masao Ohkubo