Patents by Inventor Hirokazu Asada

Hirokazu Asada 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).

  • Vessel for molten metal
    Patent number: 8460601
    Abstract: The invention provides a vessel for molten metal comprising a vessel body formed of an alumina-silica-based material, and a protective layer formed of a silicon nitride- alumina-based material provided on the inner surface of the vessel body, wherein the material for the vessel body is adjusted to have an alumina content x of 72 to 95 parts by weight per 100 total parts by weight of alumina and silica, and the material for the protective layer is adjusted to have a silicon nitride content y per 100 total parts by weight of silicon nitride and alumina in such a manner that y applies to the following formulae: (1) y<?1.1x+128 and (2) y>?0.5x+62.5. The present invention provides a vessel for molten metal having excellent durability and corrosion resistance against hot molten metal.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: June 11, 2013
    Assignee: Nippon Crucible Co., Ltd.
    Inventors: Hideaki Ohashi, Nobuyuki Oka, Hirokazu Asada
  • VESSEL FOR MOLTEN METAL
    Publication number: 20100289195
    Abstract: The invention provides a vessel for molten metal comprising a vessel body formed of an alumina-silica-based material, and a protective layer formed of a silicon nitride-alumina-based material provided on the inner surface of the vessel body, wherein the material for the vessel body is adjusted to have an alumina content x of 72 to 95 parts by weight per 100 total parts by weight of alumina and silica, and the material for the protective layer is adjusted to have a silicon nitride content y per 100 total parts by weight of silicon nitride and alumina in such a manner that y applies to the following formulae (1) and (2): y<?1.1x+128 ??(1) y>?0.5x+62.5 ??(2). The present invention provides a vessel for molten metal having excellent durability and corrosion resistance against hot molten metal.
    Type: Application
    Filed: March 10, 2009
    Publication date: November 18, 2010
    Applicant: NIPPON CRUCIBLE CO., LTD.
    Inventors: Hideaki Ohashi, Nobuyuki Oka, Hirokazu Asada
  • Carbonaceous ceramic composite for use in contact with molten nonferrous metal
    Patent number: 5135893
    Abstract: This invention provides a carbon-containing ceramic composite for molten non-ferrous metal, the composite being a sintered ceramic body to be used in contact with molten non-ferrous metal, the sintered body containing an aggregate of silicon carbide and/or silicone nitride, the sintered body being characterized in that it comprises,(a) 100 parts by weight of the aggregate,(b) 5 to 45 parts by weight of flake graphite, and(c) boron carbide in an amount of 10 to 40% by weight based on the flake graphite.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: August 4, 1992
    Assignee: Osaka Gas Company Limited
    Inventors: Shoji Dohi, Akio Nakashiba, Kengo Hamada, Shigenobu Yurugi, Hiroshi Sano, Yoshitaka Hayashi, Akira Nishihira, Hirokazu Asada, Mineyoshi Nishinou, Mamoru Imajo