Patents by Inventor Kouichi Kumashiro

Kouichi Kumashiro 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).

  • Toner for electrostatic image and process of producing the same
    Patent number: 5176978
    Abstract: A dry toner for developing electrostatic images is disclosed, which comprises a binder resin, a colorant and a wax consisting of a low molecular weight polypropylene and a high density polyethylene having a density of 0.96 or more, a molecular weight of 2,000 to 20,000 and an acid value of 1 or less, wherein the wax is dispersed in the binder resin to form domains having a size of 0.1 to 1.5 .mu.m. A process for producing the toner is also disclosed.
    Type: Grant
    Filed: October 17, 1991
    Date of Patent: January 5, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kouichi Kumashiro, Tetsu Torigoe, Chiaki Suzuki, Takaichi Kimura, Takayoshi Aoki