Patents by Inventor Ryosuke Takayama

Ryosuke Takayama 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).

  • Electrophotographic roller, process cartridge and electrophotographic image forming apparatus
    Patent number: 11971668
    Abstract: An electrophotographic roller comprising a substrate and a foam layer on an outer peripheral surface of the substrate, the foam layer constituting an outer surface of the electrophotographic roller, the foam layer comprising cells each of which opens on the outer surface, and the foam layer having a zero-point charge measured using a standard carrier of 40 ?C/g or more.
    Type: Grant
    Filed: April 6, 2023
    Date of Patent: April 30, 2024
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryosuke Takayama, Hiroaki Komatsu, Koji Yatsu, Seiji Tsuru
  • ELECTROPHOTOGRAPHIC ROLLER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS
    Publication number: 20230333496
    Abstract: An electrophotographic roller comprising a substrate and a foam layer on an outer peripheral surface of the substrate, the foam layer constituting an outer surface of the electrophotographic roller, the foam layer comprising cells each of which opens on the outer surface, and the foam layer having a zero-point charge measured using a standard carrier of 40 ?C/g or more.
    Type: Application
    Filed: April 6, 2023
    Publication date: October 19, 2023
    Inventors: RYOSUKE TAKAYAMA, HIROAKI KOMATSU, KOJI YATSU, SEIJI TSURU
  • Electrophotographic blade, process cartridge, and electrophotographic image forming apparatus
    Patent number: 11262670
    Abstract: An electrophotographic blade to be brought into contact with a contact member, comprises a plate spring, and a resin layer that covers at least a part of a surface of the plate spring to form a contact region that comes into contact with a contact member. In the state where one of ends of the plate spring is fixed, a length (L) from the fixed end to the another end is 5 mm to 20 mm, and a force needed to displace the another end by 1 mm is 5 N/m to 100 N/m. The resin layer satisfies the requirements: (1) the thickness of the resin layer is 0.05 mm to 2.00 mm, (2) the tan ? value of the resin layer in the range of 5° C. to 40° C. is 0.05 to 0.70, and (3) the elastic modulus of the resin layer is 1.0 to 60.0 MPa.
    Type: Grant
    Filed: April 2, 2021
    Date of Patent: March 1, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Mochizuki, Ryosuke Takayama, Takahiro Miyazawa
  • ELECTROPHOTOGRAPHIC BLADE, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS
    Publication number: 20210318637
    Abstract: An electrophotographic blade to be brought into contact with a contact member, comprises a plate spring, and a resin layer that covers at least a part of a surface of the plate spring to form a contact region that comes into contact with a contact member. In the state where one of ends of the plate spring is fixed, a length (L) from the fixed end to the another end is 5 mm to 20 mm, and a force needed to displace the another end by 1 mm is 5 N/m to 100 N/m. The resin layer satisfies the requirements: (1) the thickness of the resin layer is 0.05 mm to 2.00 mm, (2) the tan ? value of the resin layer in the range of 5° C. to 40° C. is 0.05 to 0.70, and (3) the elastic modulus of the resin layer is 1.0 to 60.0 MPa.
    Type: Application
    Filed: April 2, 2021
    Publication date: October 14, 2021
    Inventors: Kenichi Mochizuki, Ryosuke Takayama, Takahiro Miyazawa