Patents by Inventor Hirotoshi Uesugi

Hirotoshi Uesugi 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).

  • Process for producing electrophotographic photosensitive member and electrophotographic photosensitive member
    Patent number: 6444384
    Abstract: A process for producing an electrophotographic photosensitive member which has a charge-generating layer and a charge-transporting layer on a substrate, has steps of applying a solution containing a charge-transporting material, binder resin, dimethoxymethane, and an aromatic hydrocarbon-based solvent having a boiling point of 130° C. or higher, and drying the solution, to form the charge-transporting layer.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: September 3, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoichi Kawamorita, Itaru Yamazaki, Nobumichi Miki, Takao Soma, Hirotoshi Uesugi
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20020068231
    Abstract: The present invention provides an electrophotographic photosensative member surface layer containing diorganopolysiloxane having, as substitutes, a perfluoro group, and a group having a substituted or unsubstituted polystyrene chain, a closed terminal and a degree of polymerization of 3 or more. The present invention also provides a process cartridge having the electrophotographic photosensative member, and a electrophotographic apparatus.
    Type: Application
    Filed: December 27, 2000
    Publication date: June 6, 2002
    Inventors: Hirotoshi Uesugi, Hideki Anayama
  • Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
    Patent number: 6395441
    Abstract: The present invention provides an electrophotographic photosensitive member having a surface layer containing diorganopolysiloxane having, as substituents, a perfluoro group, and a group having a substituted or unsubstituted polystyrene chain, a closed terminal and a degree of polymerization of 3 or more. The present invention also provides a process cartridge having the electrophotographic photosensitive member, and an electrophotographic apparatus.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: May 28, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirotoshi Uesugi, Hideki Anayama
  • Process for producing electrophotographic photosensitive member and electrophotographic photosensitive member
    Publication number: 20020001767
    Abstract: A process for producing an electrophotographic photosensitive member which has a charge-generating layer and a charge-transporting layer on a substrate, has steps of applying a solution containing a charge-transporting material, binder resin, dimethoxymethane, and an aromatic hydrocarbon-based solvent having a boiling point of 130° C. or higher, and drying the solution, to form the charge-transporting layer.
    Type: Application
    Filed: February 23, 2001
    Publication date: January 3, 2002
    Inventors: Yoichi Kawamorita, Itaru Yamazaki, Nobumichi Miki, Takao Soma, Hirotoshi Uesugi
  • Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
    Patent number: 6185398
    Abstract: An electrophotographic photosensitive member is constituted by a support and a photosensitive layer disposed on the support. The electrophotographic photosensitive member has a surface layer comprising a polyester resin having a recurring unit represented by the following formula (1): wherein A1 represents a substituted or unsubstituted divalent aliphatic hydrocarbon group. The resultant surface layer is effective in improving an abrasive resistance of the photosensitive member.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: February 6, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takakazu Tanaka, Hidetoshi Hirano, Hirotoshi Uesugi