Patents by Inventor Seiya Ishikawa

Seiya Ishikawa 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).

  • Developing unit
    Patent number: 11774876
    Abstract: A seal member includes a seal surface that comes into contact with and slides with an end portion of an outer circumferential surface of a developing roller. The seal surface includes a first seal region configured of a plurality of first fiber bundles including a first fiber having a charge property that repels a developer, and a second seal region configured of a plurality of second fiber bundles including a second fiber having a charge property that attracts the developer, both extending in an inclined direction such that a portion thereof closer to an opening portion of a frame body of a developing unit is located further downstream in a rotating direction of the developing roller, and being alternately disposed in the rotating direction, and a proportion of a portion occupied by the second fiber bundles on the seal surface is at least 5% and not more than 60%.
    Type: Grant
    Filed: August 18, 2022
    Date of Patent: October 3, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yu Fukasawa, Seiya Ishikawa, Masanari Morioka
  • CARTRIDGE AND IMAGE FORMING APPARATUS
    Publication number: 20230205128
    Abstract: [Task] To further develop conventional technique.
    Type: Application
    Filed: March 6, 2023
    Publication date: June 29, 2023
    Inventors: SOHTA SUGIMOTO, SHUNSUKE HIJIKATA, NAOKI HAYASHI, YU FUKASAWA, SEIYA ISHIKAWA, SHINICHI NISHIDA, SHINJIRO TOBA, TAKEO KAWANAMI, YUICHI FUKUI, YASUYUKI EGAMI
  • DEVELOPING UNIT
    Publication number: 20230061093
    Abstract: A seal member includes a seal surface that comes into contact with and slides with an end portion of an outer circumferential surface of a developing roller. The seal surface includes a first seal region configured of a plurality of first fiber bundles including a first fiber having a charge property that repels a developer, and a second seal region configured of a plurality of second fiber bundles including a second fiber having a charge property that attracts the developer, both extending in an inclined direction such that a portion thereof closer to an opening portion of a frame body of a developing unit is located further downstream in a rotating direction of the developing roller, and being alternately disposed in the rotating direction, and a proportion of a portion occupied by the second fiber bundles on the seal surface is at least 5% and not more than 60%.
    Type: Application
    Filed: August 18, 2022
    Publication date: March 2, 2023
    Inventors: Yu Fukasawa, Seiya Ishikawa, Masanari Morioka