Patents by Inventor Masafumi Hisamura

Masafumi Hisamura 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).

  • Charging member, electrophotographic apparatus and charging method using the same
    Patent number: 5669047
    Abstract: A charging member for electrophotography comprising a surface layer, wherein the surface layer comprises a resin and an alkali metal salt contained therein.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: September 16, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masami Okuda, Hisami Tanaka, Junichi Kishi, Hiroyuki Ohmori, Takashi Koyama, Masafumi Hisamura
  • Member for charging with surface layer of N-alkoxymethylated nylon effecting charging at lower voltage
    Patent number: 5112708
    Abstract: A member for charging comprises a surface layer formed of a N-alkoxymethylated nylon. A contact charging method performs charging of a member to be charged arranged in contact with the member for charging by applying externally a voltage on the member for charging. An electrophotographic device comprises the member for charging and an electrophotographic photosensitive member arranged in contact with the member for charging.
    Type: Grant
    Filed: May 2, 1991
    Date of Patent: May 12, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masami Okunuki, Hisami Tanaka, Hiroyuki Ohmori, Masafumi Hisamura
  • Electrophotographic photosensitive member with fine spherical resin powder
    Patent number: 4948690
    Abstract: An electrophotographic photosensitive member comprises an intermediate layer between a support and a photosensitive layer, wherein said intermediate layer contains spherical resin fine powder.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: August 14, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masafumi Hisamura, Naoto Fujimura, Hisami Tanaka
  • Image holding member and image forming device
    Patent number: 4943819
    Abstract: The present invention is an image holding member for holding particulate dry process developer by electrical adsorption force, having from the side holding the dry process developer, a dielectric layer, a diffusion reflection layer having reflective fine particles dispersed in a resin and an electroconductive layer. The electrical resistance of the diffusion reflection layer is made smaller than that of the dielectric layer, and/or the ten-point average roughness of the dielectric layer is made 0.1 .mu.m to 5.0 .mu.m.
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: July 24, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Toma, Masafumi Hisamura, Shigemori Tanaka
  • Electrophotographic photosensitive member
    Patent number: 4932860
    Abstract: An electrophotographic photosensitive member comprises a photosensitive layer containing an organic photoconductor provided on an electroconductive substrate, wherein said photosensitive layer contains a compound represented by the formula (1) shown below in an amount ranging from 0.1 to 10% by weight based on the total weight of the photosensitive layer added;Formula: ##STR1## wherein R represents ##STR2## X.sub.1, X.sub.2 and X.sub.3 each represent hydrogen atom or methyl group, X.sub.4 represents ##STR3## X.sub.5 represents hydrogen atom, an alkyl group or an alkenyl group.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: June 12, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Yoshihara, Masaaki Hiro, Yoichi Kawamorita, Masaru Nakagawa, Fumio Sumino, Noboru Kashimura, Masafumi Hisamura, Tomohiro Kimura
  • Photosensitive member for electrophotography
    Patent number: 4877701
    Abstract: A photosensitive member for electrophotography which is excellent in successive copying characteristics as well as mechanical durability is provided. The photosensitive member comprises a photosensitive layer, at least the surface portion of which comprises a lubricant, and a charge-transporting substance having an oxidation potential of 0.6 volt or above.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: October 31, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaaki Hiro, Tomohiro Kimura, Hisami Tanaka, Noboru Kashimura, Shigemori Tanaka, Hitoshi Tohma, Masafumi Hisamura
  • Electrophotographic photosensitive member having surface layer containing fine spherical resin powder and apparatus utilizing the same
    Patent number: 4766048
    Abstract: An electrophotographic photosensitive member comprises an electroconductive support and a photosensitive layer laid thereon, the electrophotographic photosensitive member having a surface layer containing fine spherical resin powder.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: August 23, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masafumi Hisamura
  • Light receiving member having tapered reflective surfaces between substrate and light receiving layer
    Patent number: 4617245
    Abstract: A light receiving member provided with a coating layer having a light receiving layer on a substrate, where the thickness of the coating layer is regularly changed within the minute width of the coating layer.
    Type: Grant
    Filed: February 1, 1985
    Date of Patent: October 14, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigemori Tanaka, Fumio Sumino, Keiji Kubo, Masafumi Hisamura, Hitoshi Toma, Naoto Fujimura