Patents by Inventor Masahiro YUKIKAWA

Masahiro YUKIKAWA 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).

  • Publication number: 20240192620
    Abstract: A resin particle contains an amorphous resin, a crystalline resin C containing a biomass-derived resin, and at least one of polyethylene terephthalate or polybutylene terephthalate, wherein the resin particle has a core-shell structure comprising a core resin and a shell resin, the core resin comprises the crystalline resin C, and the proportion of the total mass of the biomass-derived resin, the polyethylene terephthalate, and the polybutylene terephthalate to the resin particle at 100 percent by mass is 30 or more percent by mass.
    Type: Application
    Filed: November 22, 2023
    Publication date: June 13, 2024
    Applicant: Ricoh Company, Ltd.
    Inventors: Yuka Mizoguchi, Akio Takei, Junichi Watanabe, Akinori Saitoh, Masahiro Yukikawa
  • Publication number: 20230305412
    Abstract: A toner includes toner matrix particles containing resin and wax; and an external additive, wherein an average number of voids per toner is 5 or more and 10 or less per toner with a void diameter ? (nm) of voids in the toner matrix particles being 500 ? ? ? 200, as measured based on cross-sectional observation by a scanning electron microscope (SEM).
    Type: Application
    Filed: March 10, 2023
    Publication date: September 28, 2023
    Applicant: Ricoh Company, Ltd
    Inventors: Masahiro YUKIKAWA, Akio Takei, Akinori Saito, Hideto Suzuki
  • Publication number: 20230014605
    Abstract: A toner includes toner base particles and external additives deposited on a surface of the toner base particle. The toner base particle includes an amorphous polyester resin, a crystalline polyester resin, a release agent, and resin particles. An abundance ratio of the crystalline polyester resin in the surface of the toner base particle as observed by TEM is 2.5% or greater but 25% or less. The resin particles are deposited at the surface of the toner base particle as observed by SEM. A ratio of aggregates of the resin particles occupying the surface of the toner base particle is 1% or greater but 70% or less, where R is a major axis of the minimum particle of the resin particles, and the resin particle having a major axis of 3R or greater is determined as the aggregate.
    Type: Application
    Filed: July 6, 2022
    Publication date: January 19, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Akinori SAITOH, Akio Takei, Toma Takebayashi, Masahiro Yukikawa, Tomomi Harashima, Hiroshi Yamada
  • Publication number: 20210356877
    Abstract: A toner includes toner base particles each including: a binder resin, a colorant, and wax; and resin particles on surfaces of the toner base particles. A standard deviation of a distance between the resin particles next to each other on the surfaces of the toner base particles is less than 500 nm.
    Type: Application
    Filed: May 12, 2021
    Publication date: November 18, 2021
    Inventors: Yasuo KAMADA, Hiroshi YAMADA, Akinori SAITOH, Akio TAKEI, Toma TAKEBAYASHI, Masahiro YUKIKAWA