Patents by Inventor Kouki Katoh

Kouki Katoh 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).

  • Electrostatic image developing toner and method for producing the toner
    Patent number: 5747210
    Abstract: An electrostatic image developing toner containing a polyester binder resin in which an oxyalkylether of a novolak phenol resin is crosslinked with polycarboxyl groups and contains 5 to 20% by weight of components having a weight-average molecular weight greater than about 1.times.10.sup.7 and is essentially free of a tetrahydrofuran-insoluble portion.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: May 5, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeru Emoto, Kumi Hasegawa, Youichi Maekawa, Kazuhito Watanabe, Kouki Katoh