Patents by Inventor Hayase YAMAMOTO

Hayase YAMAMOTO 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 photosensitive member, process cartridge, and image forming apparatus
    Patent number: 11243481
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material. The binder resin includes a polyester resin. The polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below. A content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: February 8, 2022
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Kazuaki Ezure, Tomofumi Shimizu, Hayase Yamamoto
  • Electrophotographic photosensitive member, process cartridge, and image forming apparatus
    Patent number: 11204561
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material. The binder resin includes a polyester resin and a polycarbonate resin. The polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below. The polycarbonate resin includes a third repeating unit represented by general formula (3) shown below and a fourth repeating unit represented by general formula (24) shown below. A content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass.
    Type: Grant
    Filed: May 5, 2020
    Date of Patent: December 21, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Kazuaki Ezure, Hayase Yamamoto
  • Electrophotographic photosensitive member, process cartridge, and image forming apparatus
    Patent number: 10996575
    Abstract: A photosensitive layer included in an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material includes a compound (1). The binder resin includes a polyarylate resin having at least one repeating unit (10) and at least one repeating unit (11). Alternatively, the binder resin includes a polycarbonate resin having a repeating unit (20) and a repeating unit (21).
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: May 4, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Kazuaki Ezure, Hayase Yamamoto, Jun Azuma
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    Publication number: 20200356018
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material. The binder resin includes a polyester resin and a polycarbonate resin. The polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below. The polycarbonate resin includes a third repeating unit represented by general formula (3) shown below and a fourth repeating unit represented by general formula (24) shown below. A content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass.
    Type: Application
    Filed: May 5, 2020
    Publication date: November 12, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Kazuaki EZURE, Hayase YAMAMOTO
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    Publication number: 20200356017
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material. The binder resin includes a polyester resin. The polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below. A content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass.
    Type: Application
    Filed: May 4, 2020
    Publication date: November 12, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Kazuaki EZURE, Tomofumi SHIMIZU, Hayase YAMAMOTO
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    Publication number: 20200233324
    Abstract: A photosensitive layer included in an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material includes a compound (1). The binder resin includes a polyarylate resin having at least one repeating unit (10) and at least one repeating unit (11). Alternatively, the binder resin includes a polycarbonate resin having a repeating unit (20) and a repeating unit (21).
    Type: Application
    Filed: January 10, 2020
    Publication date: July 23, 2020
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Kazuaki EZURE, Hayase YAMAMOTO, Jun AZUMA