Patents by Inventor Yoshifumi Tokuhisa

Yoshifumi Tokuhisa 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).

  • Patent number: 6106986
    Abstract: A color toner comprising (A) a resin binder comprising a polyester, as a main component, obtained by polycondensing a polyhydric alcohol component and a carboxylic acid component, wherein the polyhydric alcohol component comprises a compound represented by the formula (I): wherein R.sup.1 is an alkylene group having 2 to 4 carbon atoms; x and y are positive numbers, wherein a sum of x and y is from 1 to 16, in an amount of 5% by mol or more of an entire polyhydric alcohol component, and wherein the carboxylic acid component comprises 50% by mol or more of a dicarboxylic acid compound and 50% by mol or less of a tricarboxylic or higher polycarboxylic acid compound; (B) a releasing agent having an average diameter size of dispersed particles in the color toner of from 0.1 to 3 .mu.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: August 22, 2000
    Assignee: Kao Corporation
    Inventors: Eiji Shirai, Shinichi Sata, Toshihiro Hattori, Hironobu Nagasaki, Yoshifumi Tokuhisa