Patents by Inventor Kohta FUKUMOTO

Kohta FUKUMOTO 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: 20250100890
    Abstract: The present invention relates to a method for producing a spherical silica powder, the method including, firing a spherical and porous silica precursor in a state where particles of the silica precursor are in contact with each other, in which the silica precursor has a sodium concentration of 1 ppm by mass to 300 ppm by mass and assuming the sodium concentration as x (ppm by mass) and a heat treatment temperature as y (° C.), the silica precursor is subjected to the heat treatment at a temperature satisfying ?0.97x+1180<y<?0.97x+1310, or the silica precursor has a pore volume of 0.1 ml/g to 2.0 ml/g and a specific surface area of 200 m2/g to 1000 m2/g.
    Type: Application
    Filed: December 11, 2024
    Publication date: March 27, 2025
    Applicants: AGC Inc., AGC SI-TECH CO., LTD.
    Inventors: Hajime KATAYAMA, Kohta FUKUMOTO, Masashi KONDO, Hiromichi KAMO, Shinnosuke ARIMITSU
  • Publication number: 20240209210
    Abstract: The present invention relates to a spherical silica powder, having a median diameter d50 of 0.5 ?m to 20 ?m, and a product A×d50, which is a product of a specific surface area A (m2/g) and the median diameter d50 (?m), of 2.7 ?m·m2/g to 5.0 ?m·m2/g. The spherical silica powder may have a dielectric loss tangent of 0.0020 or less at a frequency of 1 GHz.
    Type: Application
    Filed: January 24, 2024
    Publication date: June 27, 2024
    Applicants: AGC Inc., AGC SI-TECH CO., LTD.
    Inventors: Hiromichi KAMO, Hajime KATAYAMA, Kohta FUKUMOTO
  • Publication number: 20240122818
    Abstract: The present invention relates to light-scattering silica particles having a light scattering property, the light-scattering silica particles including: a plurality of hollow portions each having a closed pore structure inside the particle, in which the light-scattering silica particles have a volume-based cumulative 50% particle diameter of 1 ?m to 500 ?m and an average circularity of 0.80 or more, and in use of the light-scattering silica particles, a reflectance A of a water cake containing 20 mg/cm2 of silica per measurement cross-sectional area at an ultraviolet wavelength of 310 nm is 30% or more.
    Type: Application
    Filed: December 27, 2023
    Publication date: April 18, 2024
    Applicants: AGC Inc., AGC SI-TECH CO., LTD.
    Inventors: Hajime KATAYAMA, Masashi KONDO, Kohta FUKUMOTO, Yuriko TAKANO, Shinnosuke ARIMITSU, Takeshi MURAKAMI, Kenji HIGASHI, Daisuke YAMAZUMI