Patents by Inventor Ikutoshi Shibuya

Ikutoshi Shibuya 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).

  • Toner for developing electrostatic image comprising vinyl polymer having hydroxyl number of 50 to 350
    Patent number: 4950574
    Abstract: A toner comprising a vinyl polymer having a hydroxyl number of 50 to 350 and a glass transition point of 35.degree. to 100.degree. C., obtained from one or more monomers having a secondary hydroxyl group and, if necessary, one or more vinyl monomers copolymerizable with the vinyl monomer having a secondary hydroxyl group, is excellent in resistance to adhesion to non-rigid polyvinyl chloride and resistance to blocking under high humidity.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: August 21, 1990
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Yuugo Kumagai, Isamu Moribe, Ikutoshi Shibuya
  • Electrophotographic plate having a charge generating layer containing an organic pigment for charge generation
    Patent number: 4657834
    Abstract: An electrophotographic plate comprising an electroconductive layer, a charge generating layer and a charge transport layer and containing a silane coupling agent at least in the charge generating layer or in the charge transport layer, or at the interface of the charge generating layer and the charge transport layer shows small dark decay, little light fatigue and high sensitivity.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: April 14, 1987
    Assignees: Hitachi, Ltd., Hitachi Chemical Co., Ltd.
    Inventors: Shigeo Tachiki, Ikutoshi Shibuya, Makoto Fujikura, Atsushi Kakuta
  • Electrophotographic plate having a charge generating layer containing an organic pigment for charge generation
    Patent number: 4565758
    Abstract: An electrophotographic plate comprising an electroconductive layer, a charge generating layer and a charge transport layer and containing a silane coupling agent at least in the charge generating layer or in the charge transport layer, or at the interface of the charge generating layer and the charge transport layer shows small dark decay, little light fatigue and high sensitivity.
    Type: Grant
    Filed: July 5, 1984
    Date of Patent: January 21, 1986
    Assignees: Hitachi, Ltd., Hitachi Chemical Company Ltd.
    Inventors: Shigeo Tachiki, Ikutoshi Shibuya, Makoto Fujikura, Atsushi Kakuta