Patents by Inventor Izumi Aiso

Izumi Aiso 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 copying apparatus having photoconductor with magnetic layer
    Patent number: 5105222
    Abstract: An electrophotographic copying apparatus is provided with a belt-shaped photoconductor comprising. A magnetic electroconductive support and a photoconductive layer are formed on the photoconduction. A magnetic cleaning member is positioned for cleaning the surface of the belt-shaped photoconductor.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: April 14, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Katsuichi Ohta, Michio Kimura, Kazuya Ishida, Izumi Aiso, Satoshi Igari
  • Electrophotographic photoconductor layered element comprising salt material undercoat layer on conductive support
    Patent number: 4871635
    Abstract: A repeatedly usable electrophotographic photoconductor comprising (a) an electroconductive support, (b) an undercoat layer containing therein at least one salt selected from the group consisting of carboxylates, amino carboxylates, phosphates, polyphosphates, phosphites, phosphate derivatives, borates, sulfates and sulfites, and (c) a photoconductive layer, which layers are successively overlaid on the electroconductive support.
    Type: Grant
    Filed: May 13, 1988
    Date of Patent: October 3, 1989
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Seki, Junichiroh Hashimoto, Michio Kimura, Hirofumi Yamanami, Satomi Mochizuki, Izumi Aiso
  • Photosensitive material for electrophotography contains organic phosphite compounds
    Patent number: 4741981
    Abstract: This invention relates to a layered type photosensitive material for electrophotography, which comprises a charge generating layer and a charge transfer layer on an electroconductive substrate, characterized by containing a trivalent organic phosphite compound as an agent for preventing light-degradation.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: May 3, 1988
    Assignee: Ricoh Co., Ltd.
    Inventors: Junichiro Hashimoto, Izumi Aiso, Hideki Akiyoshi