Patents by Inventor Tetsuya Ohshima

Tetsuya Ohshima 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 composition having a dye composition
    Patent number: 4568624
    Abstract: A dye composition prepared by polymerizing an unsaturated monomer in the presence of a quinoneimine dye and an azo initiator in amounts expressed by x.gtoreq.5 and y.gtoreq.0.33x.sup.1.2 wherein x is the amount of the quinoneimine dye in % by weight based on the unsaturated monomer, and y is the amount of the azo initiator in % by weight based on the unsaturated monomer. The composition is useful for preparing toners for developing electrostatic images because of its outstanding charge control effect and also for preparing electrostatic coating powder compositions.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: February 4, 1986
    Assignees: Nippon Gosei Kagaku Kogyo Kabushiki Kaisha, Orient Chemical Industries Ltd.
    Inventors: Tetsuya Ohshima, Hisashi Senshu, Takeshi Matsuyama, Yoji Kawagishi, Takuo Andoh, Takashi Kiryu