Patents by Inventor Yoshinobu Jo

Yoshinobu Jo 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).

  • Magnetic toner, image forming method, surface-modified fine silica powder and process for its production
    Patent number: 5480755
    Abstract: A magnetic toner has magnetic resin particles containing at least a binder resin, a charge control agent and a magnetic powder. The surface-modified fine silica powder being a fine silica powder has been treated with a hydrophobicizing agent. The fine silica powder has a specific surface area of not less than 180 m.sup.2 /g, a hydrophobicity of from 60% to 95% and a bulk density of from 35 g/lit. to 49 g/lit.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: January 2, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaki Uchiyama, Yoshinobu Jo, Yasutaka Akashi, Masaaki Taya, Makoto Unno