Patents by Inventor Etsuro Nakagawa

Etsuro Nakagawa 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).

  • Electrophotographic toner and contact development method using the toner
    Patent number: 5804347
    Abstract: This invention provides an electrophotographic toner comprising the polyester resin being fixing resin and the electric charge control resin having the functional group that endows positively charging property to the toner, in which the polyester resin has an acid value of not more than 10 mgKOH/g and a hydroxyl value of not more than 40 mgKOH/g, and the functional group is present in 2 to 5 mol % in the electric charge control resin. This electrophotographic toner has stable positively charging property, so that good image is obtainable.
    Type: Grant
    Filed: June 5, 1996
    Date of Patent: September 8, 1998
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Kazushige Inoue, Toru Takatsuna, Yukihiro Mori, Etsuro Nakagawa, Hiroko Higuchi