Patents by Inventor Mizue Fujimori

Mizue Fujimori 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).

  • Modification of pigment and electrophotographic photoreceptor with modified pigment
    Patent number: 5403687
    Abstract: A method of modifying a pigment which comprises dissolving the pigment into sulfuric acid and then mixing water with the pigment-sulfuric acid solution. The modified pigment is excellent in achieving uniform dispersion and has a small particle size. An electrophotographic photoreceptor containing the modified pigment as the organic photoconductor has uniform sensitivity, sufficient charge acceptance and small dark decay.
    Type: Grant
    Filed: June 4, 1993
    Date of Patent: April 4, 1995
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Mizue Fujimori, Yorinobu Yamada
  • Electrophotographic photoreceptor
    Patent number: 5368965
    Abstract: An electrophotographic photoreceptor comprises an .alpha.-form copper phthalocyanine composition, which is obtained by treating a copper tetranitrophthalocyanine and copper phthalocyanine simultaneously to convert the crystalline form into .alpha.-form, and a photoconductive squarylium compound as the photoconductive material, and the ratios of the copper tetranitrophthalocyanine and the squarylium compound to the .alpha.-form copper phthalocyanine composition are limited to a particular range. The photoreceptor has a high photosensitivity and an excellent durability.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: November 29, 1994
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Mizue Fujimori, Ken Nagasawa, Yorinobu Yamada