Patents by Inventor Kimiyuki Ito

Kimiyuki Ito 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).

  • Publication number: 20020048711
    Abstract: The invention relates to an electrophotographic photosensitive member, and more specifically, to a photosensitive member having a photosensitive layer superimposed over a substrate. In one aspect of the invention, sequential laminations of a dispersion layer of conductive tantalum-doped tin oxide powder dispersed in a binder resin solution, are provided between the substrate layer and the photosensitive layer. Another aspect of the invention relates to a protective layer provided for the photosensitive layer. The protective layer of the most exterior surface of the photosensitive member may be a dispersion layer formed by dispersing tantalum-doped tin oxide powder in a resin solution.
    Type: Application
    Filed: September 19, 2001
    Publication date: April 25, 2002
    Applicant: Minolta Co., Ltd.
    Inventors: Kimiyuki Ito, Keiichi Inagaki, Takeshi Ishida
  • Patent number: 5294510
    Abstract: A photosensitive member is disclosed, which comprises a photosensitive layer containing a fluorescent bleaching agent comprising a coumarin compound represented by the formula (I): ##STR1##
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: March 15, 1994
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hideaki Ueda, Shigeaki Tokutake, Kimiyuki Ito, Yuki Shimada
  • Patent number: 5128228
    Abstract: This invention relates to a photosensitive member with a charge generating layer and a charge transporting layer laminated on an electrically conductive substrate, in which the charge transporting layer comprises a charge transporting material and an aniline derivative represented by the following general formula [I] below; ##STR1## in which R.sub.1 and R.sub.2 are respectively an alkyl group or an aralkyl group, each of which may have a substituent; R.sub.3 -R.sub.7 are respectively a hydrogen atom, an alkyl group, an alkoxy group, a hydroxy group, an aryl group, an aralkyl group or a halogen atom.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: July 7, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hideaki Ueda, Mitsutoshi Sakamoto, Kimiyuki Ito, Yuki Shimada
  • Patent number: 4945021
    Abstract: The present invention relates to a photosensitive member containing a specific bisazo compound described by general structural formula[I] and formed on an electrically conductive substrate; ##STR1## Wherein X is a hydrogen atom, halogen atom, alkyl radical, alkoxi radical, nitro radical or cyano radical; A is a diatomic radical selected from among the following: ##STR2## B is a coupler described by formulae [II] through [VI]; ##STR3## R is a hydrogen atom, halogen atom, alkyl radical, alkoxi radical, nitro radical or cyano radical; and Y is an aromatic carbocyclic residue or aromatic heterocyclic residue, each of which may have a substituent; G is a carbamoyl radical or sulfamoyl radical and may have a substituent; R.sub.1 is a hydrogen atom, alkyl radical, amino radical or carbamoyl radical, each of which may have a substituent, a carboxyl radical or cyano radical; M is an aryl group which may have a substituent, which is improved in photosensitivity and dispersibility.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: July 31, 1990
    Assignees: Minolta Camera Kabushiki Kaisha, Osaka Municipal Government
    Inventors: Masakazu Takata, Takamasa Ueda, Kimiyuki Ito, Yuko Mikasa, Yuki Shimada, Tsuneaki Hirashima, Souichi Yamamoto, Yoshio Ishino, Toshinobu Ohno
  • Patent number: 4871633
    Abstract: The present invention uses an azo pigment having in the center of an N-oxide heterocyclic structure as a photoelectrical charge-generating material. The pigments are excellent in dispersion stability in a dispersed solution, and enable the provision of a photosensitive member excellent in sensitivity properties.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: October 3, 1989
    Assignees: Minolta Camera Kabushiki Kaisha, Osaka Municipal Government
    Inventors: Masakazu Takata, Takamasa Ueda, Kimiyuki Ito, Tsuneaki Hirashima, Souichi Yamamoto, Yoshio Ishino, Toshinobu Ohno
  • Patent number: 4865934
    Abstract: The present invention relates a photosensitive member which has a charge generating layer comprising specific phthalocyanine as a charge generating material and specific resin as a binder, and/or a charge transporting layer comprising specific hydrazone compounds as a charge transporting material and dyes as an absorbent for undesired lights.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: September 12, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hideaki Ueda, Mitsutoshi Sakamoto, Kimiyuki Ito