Patents by Inventor Eileen Takeuchi

Eileen Takeuchi 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: 20200393772
    Abstract: The present disclosure provides an electrophotographic photosensitive member having a surface layer in which an occurrence of the image deletion is suppressed; a process cartridge equipped with the electrophotographic photosensitive member; and an electrophotographic apparatus provided with the process cartridge. An electrophotographic photosensitive member has a surface layer that includes a copolymerized product of a composition including a metal oxide particle having a polymerizable functional group on a surface thereof and a polymerizable compound having a particular structure.
    Type: Application
    Filed: June 8, 2020
    Publication date: December 17, 2020
    Inventors: Eileen Takeuchi, Koichi Nakata, Shubun Kujirai, Haruki Mori
  • Publication number: 20200225595
    Abstract: Provided is an electrophotographic photosensitive member in which the generation of a positive ghost image is suppressed under a low-temperature and low-humidity environment, and the occurrence of cracking is suppressed under a high-temperature and high-humidity environment. Also provided are a process cartridge mounted with the electrophotographic photosensitive member, and an electrophotographic apparatus including the process cartridge. The electrophotographic photosensitive member of the present disclosure is characterized in that an undercoat layer contains aluminum oxide particles and titanium oxide particles at a specific mass ratio.
    Type: Application
    Filed: March 27, 2020
    Publication date: July 16, 2020
    Inventors: Eileen Takeuchi, Kumiko Takizawa, Ikuyo Kuroiwa, Tsuyoshi Shimada, Wataru Kitamura
  • Publication number: 20200218171
    Abstract: Provided is an electrophotographic photosensitive member including a surface layer containing: a copolymerization product of a composition containing a hole-transportable compound having a chain-polymerizable functional group and a compound having a specific structure; and metal oxide particles.
    Type: Application
    Filed: December 31, 2019
    Publication date: July 9, 2020
    Inventors: Eileen Takeuchi, Koichi Nakata, Shubun Kujirai, Haruki Mori
  • Patent number: 10705440
    Abstract: Provided is an electrophotographic photosensitive member that can suppress the generation of both an interference fringe and a streaky uneven part in a circumferential direction on an image. The generation of the interference fringe and the generation of the streaky uneven part in the circumferential direction on the image are suppressed by defining a length of a line-shaped groove of a support in a circumferential direction, and defining roughness parameters of a support in an axial direction.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: July 7, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takanori Ueno, Kumiko Takizawa, Ikuyo Kuroiwa, Tsuyoshi Shimada, Wataru Kitamura, Eileen Takeuchi
  • Publication number: 20200159136
    Abstract: Provided is an electrophotographic photosensitive member that can achieve both of satisfactory wear resistance and the suppression of an image streak at the time of its repeated use. The electrophotographic photosensitive member includes a support and a photosensitive layer. The surface layer of the electrophotographic photosensitive member contains: a polymer of a hole-transportable compound having a chain-polymerizable functional group; and an ester compound having specific alkyl groups.
    Type: Application
    Filed: November 4, 2019
    Publication date: May 21, 2020
    Inventors: Haruki Mori, Masaki Nonaka, Eileen Takeuchi
  • Publication number: 20190369513
    Abstract: Provided is an electrophotographic photosensitive member that can suppress the generation of both an interference fringe and a streaky uneven part in a circumferential direction on an image. The generation of the interference fringe and the generation of the streaky uneven part in the circumferential direction on the image are suppressed by defining a length of a line-shaped groove of a support in a circumferential direction, and defining roughness parameters of a support in an axial direction.
    Type: Application
    Filed: May 30, 2019
    Publication date: December 5, 2019
    Inventors: Takanori Ueno, Kumiko Takizawa, Ikuyo Kuroiwa, Tsuyoshi Shimada, Wataru Kitamura, Eileen Takeuchi
  • Patent number: 10488770
    Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus in which residual potential is suppressed and a ghost image is prevented from being generated in a low-humidity environment in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member including: an undercoat layer containing a strontium titanate particle having a maximum peak at a position of 2?=32.20±0.20 (? represents a Bragg angle) in a CuK? characteristic X-ray diffraction pattern and a half-value width of the maximum peak of 0.10 deg or more and 0.50 deg or less, and a titanium oxide particle; and a photosensitive layer containing a polyvinyl butyral resin, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: November 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ikuyo Kuroiwa, Wataru Kitamura, Kumiko Takizawa, Tsuyoshi Shimada, Eileen Takeuchi
  • Patent number: 10353340
    Abstract: There is provided an electrophotographic photosensitive member in which the variation in potential during repeated use is reduced. The electrophotographic photosensitive member is the electrophotographic photosensitive member of which an undercoat layer comprises a urethane resin and titanium oxide particles whose primary particle and secondary particle diameters are defined.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: July 16, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ikuyo Kuroiwa, Kumiko Takizawa, Tsuyoshi Shimada, Eileen Takeuchi, Wataru Kitamura
  • Publication number: 20190094735
    Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus in which residual potential is suppressed and a ghost image is prevented from being generated in a low-humidity environment in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member including: an undercoat layer containing a strontium titanate particle having a maximum peak at a position of 2?=32.20±0.20 (? represents a Bragg angle) in a CuK? characteristic X-ray diffraction pattern and a half-value width of the maximum peak of 0.10 deg or more and 0.50 deg or less, and a titanium oxide particle; and a photosensitive layer containing a polyvinyl butyral resin, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
    Type: Application
    Filed: September 19, 2018
    Publication date: March 28, 2019
    Inventors: Ikuyo Kuroiwa, Wataru Kitamura, Kumiko Takizawa, Tsuyoshi Shimada, Eileen Takeuchi
  • Patent number: 10241429
    Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus that are excellent in charging properties and can suppress residual potential in the case where a strontium titanate particle is used as a metal oxide particle in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member in which an undercoat layer contains a strontium titanate particle having a maximum peak at a position of 2?=32.20±0.20 (? represents a Bragg angle) in a CuK? characteristic X-ray diffraction pattern, the maximum peak having a half-value width of 0.10 deg or more and 0.50 deg or less, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: March 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tsuyoshi Shimada, Kumiko Takizawa, Eileen Takeuchi, Ikuyo Kuroiwa, Wataru Kitamura, Kan Tanabe, Haruhiko Mitsuda
  • Publication number: 20180314173
    Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus that are excellent in charging properties and can suppress residual potential in the case where a strontium titanate particle is used as a metal oxide particle in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member in which an undercoat layer contains a strontium titanate particle having a maximum peak at a position of 2?=32.20±0.20 (? represents a Bragg angle) in a CuK? characteristic X-ray diffraction pattern, the maximum peak having a half-value width of 0.10 deg or more and 0.50 deg or less, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
    Type: Application
    Filed: April 24, 2018
    Publication date: November 1, 2018
    Inventors: Tsuyoshi Shimada, Kumiko Takizawa, Eileen Takeuchi, Ikuyo Kuroiwa, Wataru Kitamura, Kan Tanabe, Haruhiko Mitsuda
  • Publication number: 20180314188
    Abstract: An electrophotographic photosensitive member, wherein fluctuation in potential is suppressed, and the occurrence of black spots is suppressed even if the electrophotographic photosensitive member is repeatedly used for a long period of time is provided. A process cartridge that is equipped with the electrophotographic photosensitive member and an electrophotographic apparatus that is equipped with the process cartridge are provided. An electrophotographic photosensitive member, wherein an undercoat layer of the electrophotographic photosensitive member contains an aluminum oxide particle that is surface-treated in a specific amount using a specific compound.
    Type: Application
    Filed: April 20, 2018
    Publication date: November 1, 2018
    Inventors: Eileen Takeuchi, Kumiko Takizawa, Ikuyo Kuroiwa, Tsuyoshi Shimada, Wataru Kitamura
  • Publication number: 20180299822
    Abstract: There is provided an electrophotographic photosensitive member in which the variation in potential during repeated use is reduced. The electrophotographic photosensitive member is the electrophotographic photosensitive member of which an undercoat layer comprises a urethane resin and titanium oxide particles whose primary particle and secondary particle diameters are defined.
    Type: Application
    Filed: April 5, 2018
    Publication date: October 18, 2018
    Inventors: Ikuyo Kuroiwa, Kumiko Takizawa, Tsuyoshi Shimada, Eileen Takeuchi, Wataru Kitamura