Patents by Inventor Toshiaki Munemitsu

Toshiaki Munemitsu 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: 4507376
    Abstract: An electrophotographic toner composition having excellent blocking resistance and offset resistance which contains as a resin binder a polymeric rosin compound having a softening point of to C., a glass transition temperature of to C. and a molecular weight of 2,000 to 40,000 prepared by the reaction of (a) a glycidyl ester of rosin, (b) a dicarboxylic acid or its anhydride, and (c) a crosslinking agent selected from the group consisting of a polyfunctional epoxy compound, a polycarboxylic acid having a valency of not less than 3 or its anhydride, and a polyhydric alcohol having a valency of not less than 3. A dihydric alcohol may be used in the above reaction in order to improve the low temperature fixing property of the toner.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: March 26, 1985
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Muneharu Makita, Osamu Oseto, Toshiaki Munemitsu