Patents by Inventor Katsutosi Iijima

Katsutosi Iijima 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).

  • Photoconductive phthalocyanine composition
    Patent number: 5283146
    Abstract: A photoconductive phthalocyanine composition is disclosed, comprising (A) a photoconductive phthalocyanine composition comprising 100 parts by weight of an unsubstituted phthalocyanine derivative and from 0.001 to 5 parts by weight of a nitro- or halogen-substituted phthalocyanine derivative and (B) from 0.01 to 10 parts by weight, per 100 parts by weight of the photoconductive phthalocyanine composition (A), of a phthalocyanine derivative having at least 4 electron attracting groups. A photosensitive layer formed of the photoconductive phthalocyanine composition produces digital signals whether input light is digital or not. It is useful as not only a photoreceptor for digital recording system of electrophotography but a photoreceptor for analogue light input in conventional PPC to provide a high quality image with sharp edges.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: February 1, 1994
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Toyoshi Ohashi, Toshiaki Ishibashi, Junko Gouda, Akira Itsubo, Toshiyuki Koyama, Masatomi Ozawa, Katsutosi Iijima