Patents by Inventor Takeshi MUTOU

Takeshi MUTOU 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: 12006242
    Abstract: A large sized opaque quartz glass ingot having an excellent heat ray shielding property, an outstanding light blocking property, high mechanical strength and small roughness of a baked finished smooth surface. The shape of bubbles inside the quartz glass are almost complete spheres and the average particle size of the bubbles is 1 ?m or less, such that the strength of the opaque quartz glass ingot is increased as the stress concentration at the edges of the bubbles is eliminated and an increase of surface roughness caused by baking is alleviated.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: June 11, 2024
    Assignee: TOSOH QUARTZ CORPORATION
    Inventors: Chiemi Ito, Takeshi Mutou, Minoru Kuniyoshi, Mutsumi Asano, Atsushi Ando
  • Publication number: 20220250962
    Abstract: A large sized opaque quartz glass ingot having an excellent heat ray shielding property, an outstanding light blocking property, high mechanical strength and small roughness of a baked finished smooth surface. The shape of bubbles inside the quartz glass are almost complete spheres and the average particle size of the bubbles is 1 ?m or less, such that the strength of the opaque quartz glass ingot is increased as the stress concentration at the edges of the bubbles is eliminated and an increase of surface roughness caused by baking is alleviated.
    Type: Application
    Filed: June 3, 2019
    Publication date: August 11, 2022
    Inventors: Chiemi ITO, Takeshi MUTOU, Minoru KUNIYOSHI, Mutsumi ASANO, Atsushi ANDO
  • Publication number: 20210403374
    Abstract: A method for manufacturing a large sized opaque quartz glass ingot having excellent heat ray shielding and light blocking properties without using a foaming agent. The obtained opaque quartz glass has small diameter spherical bubbles and a preferable mechanical strength. Silica powder is dispersed in water to form a slurry having a silica powder concentration of 45 to 75 wt % and the average particle size of the silica powder is adjusted to 8 ?m or less and the standard deviation of the particle size is adjusted to 6 ?m or more by wet pulverization. The slurry is sprayed for forming granules of the silica powder. An opaque quartz glass ingot with a small bubble diameter and high mechanical strength is obtained by melting the granulated silica powder.
    Type: Application
    Filed: December 14, 2018
    Publication date: December 30, 2021
    Inventors: Chiemi ITO, Takeshi MUTOU, Masahiro SATO, Takaya SUZUKI, Minoru KUNIYOSHI