Patents by Inventor Toshiki Chiba

Toshiki Chiba 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: 20220177318
    Abstract: The present invention provides colloidal silica that exhibits excellent abrasiveness and contains, with high purity, deformed silica particles with excellent compactness and a large amount of alkoxy groups per unit area; the invention also provides a method for producing the colloidal silica in a simple manner with reduced costs. The invention provides colloidal silica containing silica particles having a bent structure and/or a branched structure, wherein the silica particles have a particle density of 1.95 or more, the silica particles have a ratio (m/n) of the content of alkoxy groups m (ppa) to the average primary particle size n (nm) of 200 or more, and the silica particles having a bent structure and/or a branched structure are present in an amount of 15% or more based on the number of particles in a given field of view as observed with a scanning electron microscope at 200,000-times magnification.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 9, 2022
    Applicant: FUSO CHEMICAL CO., LTD.
    Inventors: Hideki Otsuki, Yoshiki Michiwaki, Yuma Negishi, Toshiki Chiba
  • Publication number: 20220144649
    Abstract: A colloidal silica is disclosed that contains, with high purity, silica particles having an appropriate particle density, a high aggregation ratio, and a high alkoxy group content, and to provide a method for producing the colloidal silica in a simple manner at reduced costs. The colloidal silica containing silica particles is disclosed, wherein the silica particles have an average primary particle size of 33 nm or more, an aggregation ratio of 1.2 or more, and a particle density of 1.95 or more, the silica particles contain 1000 ppm by mass or more of alkoxy groups per gram of the silica particles, the proportion of the number of silica particles having an equivalent circle diameter under 20 nm is less than 15%, and the silica particles contain a primary amine in an amount of 5 ?mol or more per gram of the silica particles.
    Type: Application
    Filed: February 26, 2020
    Publication date: May 12, 2022
    Applicant: FUSO CHEMICAL CO., LTD.
    Inventors: Yuma Negishi, Hideki Otsuki, Hiroaki Yamashita, Toshiki Chiba