Patents by Inventor Kazuo Itoya

Kazuo Itoya 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 process for the preparation thereof
    Patent number: 5885743
    Abstract: Disclosed are an electrophotographic toner which is a spherical particle comprising a binder resin having encapsulated therein a colorant and has a volume average particle size of from 3 to 12 .mu.m, the binder resin being a non-crosslinked styrene-acrylic resin having an acid value of from 30 to 120, containing from 5 to 60% by weight of the components having a molecular weight in terms of polystyrene by gel permeation chromatography of 200,000 or more and having a ratio (Mw/Mn) of the weight-average molecular weight Mw to the number-average molecular weight Mn of from 4 to 30; and a process for preparing an electrophotographic toner comprising spherical particles having a volume average grain size of from 3 to 12 .mu.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: March 23, 1999
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hitoshi Takayanagi, Hiroko Sakurai, Kazuo Itoya, Kinji Shinzo, Yukiko Soma, Kenichi Hirabayashi, Koichiro Matsuki, Minoru Nomura, Takashi Ito, Hiroyuki Ohminato