Patents by Inventor Ikuko YATSUZUKA

Ikuko YATSUZUKA 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).

  • Patent number: 12541159
    Abstract: A toner particle for developing an electrostatically charged image includes a toner base particle and a resin coating covering the toner base particle. The toner base particle includes a recess on a surface of the toner base particle. The recess has a depth of 50 nm to 500 nm. The resin coating includes a coating (A) portion having a thickness of 10 nm or more and less than 50 nm and a coating (B) portion having a thickness of 50 nm or more and 500 nm or less, and the coating (B) portion is present on the recess.
    Type: Grant
    Filed: November 24, 2020
    Date of Patent: February 3, 2026
    Assignee: TOMOEGAWA CORPORATION
    Inventors: Yudai Kimura, Ikuko Yatsuzuka, Takayuki Sano
  • Publication number: 20220404729
    Abstract: [Object] To provide toner particles for developing an electrostatically charged image which are hardly affected by a particle size of resin fine particles and are more excellent in fixability and heat-resistant preservability. [Solution] A toner particle for developing an electrostatically charged image including a toner base particle and a resin coating covering the toner base particle, in which the toner base particle includes a recess on a surface of the toner base particle, the recess includes a recess having a depth of 50 nm to 500 nm, the resin coating includes a coating (A) portion having a thickness of 10 nm or more and less than 50 nm and a coating (B) portion having a thickness of 50 nm or more and 500 nm or less, and the coating (B) portion is present on the recess.
    Type: Application
    Filed: November 24, 2020
    Publication date: December 22, 2022
    Inventors: Yudai KIMURA, Ikuko YATSUZUKA, Takayuki SANO