Patents by Inventor Yuziro Ito

Yuziro Ito 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: 5028360
    Abstract: A method of manufacturing spherical silica particles comprising the steps of processing in an acid-containing solution and then washing with water the coagulant derived from an aqueous alkali metal silicate solution extruded through pores in a water-miscible organic medium or acid solution, wet-grinding the amorphous silica thus obtained in a liquid dispersion medium to obtain a fine particle silica suspension with a weight average particle size of 10 .mu.m or less, spray-drying this fine particle silica suspension with hot air and sintering the spherical granulated silica thus obtained. According to the present invention, the high-purity spherical silica particles can be obtained with high solidity and adjusted surface smoothness without any complicated operation or waste water treatment for use as a sealant filler for highly-integrated IC electronic parts.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: July 2, 1991
    Assignee: Nitto Chemical Industries Co., Ltd.
    Inventors: Yuziro Ito, Takashi Higashiogawa, Masahiro Matsuura, Koichi Orii, Yasumasa Yamaguchi