Patents by Inventor Hiroaki HAMAMURA

Hiroaki HAMAMURA 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).

  • Barium sulfate powder and resin composition comprising same
    Patent number: 11434378
    Abstract: The present invention relates to fine barium sulfate powder that can be readily and simply dispersed in resins or solvents; a resin composition, a coating composition, an ink composition, and a resin molded article each containing the barium sulfate powder; and a method for producing the barium sulfate powder. Provided is barium sulfate powder having a number average primary particle size of 1 to 100 nm, the powder including an organic compound on its surface, the powder in the form of compressed compact having a contact angle with distilled water of 10 to 170 degrees.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: September 6, 2022
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Tsutomu Yamamoto, Hironobu Ogata, Hiroaki Hamamura, Masayuki Asada
  • BARIUM SULFATE POWDER AND RESIN COMPOSITION COMPRISING SAME
    Publication number: 20210139709
    Abstract: The present invention relates to fine barium sulfate powder that can be readily and simply dispersed in resins or solvents; a resin composition, a coating composition, an ink composition, and a resin molded article each containing the barium sulfate powder; and a method for producing the barium sulfate powder. Provided is barium sulfate powder having a number average primary particle size of 1 to 100 nm, the powder including an organic compound on its surface, the powder in the form of compressed compact having a contact angle with distilled water of 10 to 170 degrees.
    Type: Application
    Filed: October 18, 2017
    Publication date: May 13, 2021
    Inventors: Tsutomu YAMAMOTO, Hironobu OGATA, Hiroaki HAMAMURA, Masayuki ASADA