Patents by Inventor Motojirou Aoi

Motojirou Aoi 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).

  • Resin composition for sealing electronic parts, and hydration-resistant magnesia powder and process for preparation thereof
    Patent number: 4766162
    Abstract: Disclosed is a resin composition for sealing electronic parts, which comprises a thermosetting resin and, incorporated therein, high-purity magnesium oxide. A hydration-resistant magnesia powder having the particle surfaces covered with a continuous and uniform coating of silica is advantageously used as the magnesium oxide. This hydration-resistant magnesia powder is prepared by introducing a heated vapor of an organic silicate compound into a reactor of a fluidized bed of magnesia powder heated at 100.degree. to 600.degree. C. so that the concentration of the organic silicate compound is 1 to 20 mole %, and precipitating a coating of silica on the surfaces of magnesia particles by thermal decomposition and/or hydrolysis of the organic silicate compound on the surfaces of magnesia particles.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: August 23, 1988
    Assignee: Ube Industries, Ltd.
    Inventors: Toshikazu Hamamoto, Motojirou Aoi, Kozaburo Yoshida, Yasuhiko Toda
  • Resin composition for sealing electronic parts, and hydration-resistant magnesia powder and process for preparation thereof
    Patent number: 4677026
    Abstract: Disclosed is a resin composition for sealing electronic parts, which comprises a thermosetting resin and, incorporated therein, high-purity magnesium oxide. A hydration-resistant magnesia powder having the particle surfaces covered with a continuous and uniform coating of silica is advantageously used as the magnesium oxide. This hydration-resistant magnesia powder is prepared by introducing a heated vapor of an organic silicate compound into a reactor of a fluidized bed of magnesia powder heated at 100.degree. to 600.degree. C. so that the concentration of the organic silicate compound is 1 to 20 mole %, and precipitating a coating of silica on the surfaces of magnesia particles by thermal decomposition and/or hydrolysis of the organic silicate compound on the surfaces of magnesia particles.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: June 30, 1987
    Assignee: Ube Industries, Ltd.
    Inventors: Toshikazu Hamamoto, Motojirou Aoi, Kozaburo Yoshida, Yasuhiko Toda