Patents by Inventor Toshirou Yamamoto

Toshirou Yamamoto 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).

  • Latent image color developing system
    Patent number: 4833505
    Abstract: A latent color image developing system for copying a document having a first color images and second color images develops the first color images with a first color developer and the second color images with a second color developer. The second color developer includes a toner and a magnetic carrier having a density of less than 4.0 g/cm.sup.3 and a particle size in the range of 30-50 microns. A developer roll is used having a main developing pole with a flux density of more than 500 gauss in a nip region proximate a photosensitive member having latent electrostatic images to be developed.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: May 23, 1989
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Nobumasa Furuya, Kazuo Maruyama, Tsuneo Noami, Takeshi Sumikawa, Toshirou Yamamoto, Kouji Adachi, Kiyoshi Horie