Patents by Inventor Kazuyuki Shishitsuka

Kazuyuki Shishitsuka 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, process cartridge and electrophotographic apparatus
    Patent number: 7962068
    Abstract: An object of the present invention is to provide a charging member in which a toner, an additive for use in the toner, or the like is hard to adhere to the surface even under repeated use for a long time, and hence the charging and image output are made stable for a long time even if the charging member is used in the DC contact charging method, and a process cartridge and an electrophotographic apparatus having the charging member. The present invention provides a charging member comprising a support, a conductive elastic layer formed on the support, and a surface layer formed on the conductive elastic layer, characterized in that the surface layer contains a polysiloxane having a fluoroalkyl group and an oxyalkylene group, and a process cartridge and an electrophotographic apparatus having the charging member.
    Type: Grant
    Filed: September 1, 2005
    Date of Patent: June 14, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriaki Kuroda, Hisao Kato, Toshinari Miura, Toshiro Suzuki, Takumi Furukawa, Michitaka Kitahara, Jun Murata, Yukinori Nagata, Masaki Ozawa, Kazuyuki Shishitsuka, Yoko Kuruma
  • Charging member, process cartridge, and electrophotographic apparatus
    Patent number: 7693457
    Abstract: A charging member has a surface layer. The surface layer contains a polysiloxane having a first unit, a second unit and a third unit each of which is represented by a specific formula. The ratio of the sum of the mole numbers of the first and second units to the sum of the mole numbers of the first to third units is in a specific range.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: April 6, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoko Kuruma, Noriaki Kuroda, Hisao Kato, Toshinari Miura, Toshiro Suzuki, Takumi Furukawa, Michitaka Kitahara, Jun Murata, Yukinori Nagata, Masaki Ozawa, Kazuyuki Shishitsuka
  • Charging member, process cartridge and electrophotographic apparatus
    Patent number: 7664434
    Abstract: A charging member is provided in which a toner, an additive for use in the toner, or the like is hard to adhere to the surface even under repeated use for a long time, and hence the charging and image output are made stable for a long time even if the charging member is used in the DC contact charging method. Also provided are a process cartridge and an electrophotographic apparatus having the charging member. The charging member includes a support, a conductive elastic layer formed on the support, and a surface layer formed on the conductive elastic layer, characterized in that the surface layer contains a polysiloxane having a fluoroalkyl group and an oxyalkylene group, and a process cartridge and an electrophotographic apparatus having the charging member.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: February 16, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriaki Kuroda, Hisao Kato, Toshinari Miura, Toshiro Suzuki, Takumi Furukawa, Michitaka Kitahara, Jun Murata, Yukinori Nagata, Masaki Ozawa, Kazuyuki Shishitsuka, Yoko Kuruma
  • CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20090238601
    Abstract: A charging member is provided in which a toner, an additive for use in the toner, or the like is hard to adhere to the surface even under repeated use for a long time, and hence the charging and image output are made stable for a long time even if the charging member is used in the DC contact charging method. Also provided are a process cartridge and an electrophotographic apparatus having the charging member. The charging member includes a support, a conductive elastic layer formed on the support, and a surface layer formed on the conductive elastic layer, characterized in that the surface layer contains a polysiloxane having a fluoroalkyl group and an oxyalkylene group, and a process cartridge and an electrophotographic apparatus having the charging member.
    Type: Application
    Filed: December 22, 2005
    Publication date: September 24, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Noriaki Kuroda, Hisao Kato, Toshinari Miura, Toshiro Suzuki, Takumi Furukawa, Michitaka Kitahara, Jun Murata, Yukinori Nagata, Masaki Ozawa, Kazuyuki Shishitsuka, Yoko Kuruma
  • CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20090080933
    Abstract: A charging member has a surface layer. The surface layer contains a polysiloxane having a first unit, a second unit and a third unit each of which is represented by a specific formula. The ratio of the sum of the mole numbers of the first and second units to the sum of the mole numbers of the first to third units is in a specific range.
    Type: Application
    Filed: December 21, 2005
    Publication date: March 26, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoko Kuruma, Noriaki Kuroda, Hisao Kato, Toshinari Miura, Toshiro Suzuki, Takumi Furukawa, Michitaka Kitahara, Jun Murata, Yukinori Nagata, Masaki Ozawa, Kazuyuki Shishitsuka
  • CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20070217823
    Abstract: An object of the present invention is to provide a charging member in which a toner, an additive for use in the toner, or the like is hard to adhere to the surface even under repeated use for a long time, and hence the charging and image output are made stable for a long time even if the charging member is used in the DC contact charging method, and a process cartridge and an electrophotographic apparatus having the charging member. The present invention provides a charging member comprising a support, a conductive elastic layer formed on the support, and a surface layer formed on the conductive elastic layer, characterized in that the surface layer contains a polysiloxane having a fluoroalkyl group and an oxyalkylene group, and a process cartridge and an electrophotographic apparatus having the charging member.
    Type: Application
    Filed: September 1, 2005
    Publication date: September 20, 2007
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Noriaki Kuroda, Hisao Kato, Toshinari Miura, Toshiro Suzuki, Takumi Furukawa, Michitaka Kitahara, Jun Murata, Yukinori Nagata, Masaki Ozawa, Kazuyuki Shishitsuka, Yoko Kuruma