Patents by Inventor Katsuya Kodama

Katsuya Kodama 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: 11835878
    Abstract: An electrophotographic roller includes: a mandrel and an elastic layer on the mandrel, and having a crown shape in which a diameter decreases from a central position O in a longitudinal direction of the mandrel toward an end portion. When a position of the end portion in the longitudinal direction of the elastic layer is defined as X2, a position between the O and the X2 is defined as Xl, a distance between the O and the X1 is defined as L1, and a distance between the X1 and the X2 is defined as L2, L1=0.6×(L1+L2). When outer diameters of the electrophotographic roller at O, X1 and X2 are defined as Do, DX1 and DX2, respectively, and Z1=(Do?DX1)/2 and Z2=(DX1?DX2)/2 are defined, Z1, Z2, L1 and L2 satisfy (Z2/L2)<1.931×(Z1/L1).
    Type: Grant
    Filed: March 23, 2023
    Date of Patent: December 5, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Katsuya Kodama, Toshiro Suzuki, Kenichi Yazawa, Atsushi Uematsu
  • ELECTROPHOTOGRAPHIC ROLLER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS
    Publication number: 20230221660
    Abstract: An electrophotographic roller includes: a mandrel and an elastic layer on the mandrel, and having a crown shape in which a diameter decreases from a central position O in a longitudinal direction of the mandrel toward an end portion. When a position of the end portion in the longitudinal direction of the elastic layer is defined as X2, a position between the O and the X2 is defined as Xl, a distance between the O and the X1 is defined as L1, and a distance between the X1 and the X2 is defined as L2, L1=0.6×(L1+L2). When outer diameters of the electrophotographic roller at O, X1 and X2 are defined as Do, DX1 and DX2, respectively, and Z1=(Do?DX1)/2 and Z2=(DX1?DX2)/2 are defined, Z1, Z2, L1 and L2 satisfy (Z2/L2)<1.931×(Z1/L1).
    Type: Application
    Filed: March 23, 2023
    Publication date: July 13, 2023
    Inventors: Katsuya Kodama, Toshiro Suzuki, Kenichi Yazawa, Atsushi Uematsu
  • Electrophotographic roller, process cartridge and electrophotographic image forming apparatus
    Patent number: 11644761
    Abstract: An electrophotographic roller includes: a mandrel and an elastic layer on the mandrel, and having a crown shape in which a diameter decreases from a central position O in a longitudinal direction of the mandrel toward an end portion. When a position of the end portion in the longitudinal direction of the elastic layer is defined as X2, a position between the O and the X2 is defined as X1, a distance between the O and the X1 is defined as L1, and a distance between the X1 and the X2 is defined as L2, L1=0.6×(L1+L2). When outer diameters of the electrophotographic roller at O, X1 and X2 are defined as Do, DX1 and DX2, respectively, and Z1=(Do?DX1)/2 and Z2=(DX1?DX2)/2 are defined, Z1, Z2, L1 and L2 satisfy (Z2/L2)<1.931×(Z1/L1).
    Type: Grant
    Filed: May 25, 2022
    Date of Patent: May 9, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Katsuya Kodama, Toshiro Suzuki, Kenichi Yazawa, Atsushi Uematsu
  • ELECTROPHOTOGRAPHIC ROLLER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS
    Publication number: 20220390876
    Abstract: An electrophotographic roller includes: a mandrel and an elastic layer on the mandrel, and having a crown shape in which a diameter decreases from a central position O in a longitudinal direction of the mandrel toward an end portion. When a position of the end portion in the longitudinal direction of the elastic layer is defined as X2, a position between the ) and the X2 is defined as X1, a distance between the O and the X1 is defined as L1, and a distance between the X1 and the X2 is defined as L2, L1=0.6×(L1+L2). When outer diameters of the electrophotographic roller at O, X1 and X2 are defined as Do, DX1 and DX2, respectively, and Z1=(Do?DX1)/2 and Z2=(DX1?DX2)/2 are defined, Z1, Z2, L1 and L2 satisfy (Z2/L2)<1.931×(Z1/L1).
    Type: Application
    Filed: May 25, 2022
    Publication date: December 8, 2022
    Inventors: Katsuya Kodama, Toshiro Suzuki, Kenichi Yazawa, Atsushi Uematsu