Patents by Inventor Sadafumi Yoshino

Sadafumi Yoshino 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).

  • Aluminum alloy for die-cast product having a high-toughness
    Patent number: 6277217
    Abstract: An aluminum alloy comprises magnesium in a range of 3.0% by weight≦Mg≦5.5% by weight, manganese in a range of 1.5% by weight≦Mn≦2.0% by weight, nickel in a range of 0.5% by weight≦Ni≦0.9% by weight, and the balance of aluminum including inevitable impurities. Particularly, the Ni content is set in the above range in order to achieve an increase in toughness of a die-cast product. Thus, it is possible to suppress the amount of an intermetallic compound AlMnNi produced and to finely divide the intermetallic compound AlMnNi.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: August 21, 2001
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Sadafumi Yoshino, Seiichi Koike, Eitarou Koya, Masahiko Nakagawa
  • Process for the purification of diaminomaleonitrile
    Patent number: 4011254
    Abstract: Diaminomaleonitrile which is produced by the tetramerization of hydrogen cyanide is purified by heating a crude diaminomaleonitrile in an inert liquid or in an inert atmosphere at a temperature of 90.degree. to 140.degree. C, preferably 100.degree. to 120.degree. C, and then extracting pure diaminomaleonitrile having a purity of about 99% from said heated crude diaminomaleonitrile with a solvent.
    Type: Grant
    Filed: August 19, 1975
    Date of Patent: March 8, 1977
    Assignee: Nippon Soda Company Limited
    Inventors: Tatsumi Kobayashi, Yutaka Takakura, Sadafumi Yoshino, Yoshiaki Fukuda
  • Process for the production of diaminomaleonitrile
    Patent number: 3971820
    Abstract: A process for tetramerizing hydrogen cyanide to diaminomaleonitrile, wherein hydrogen cyanide is polymerized in an organic solvent in the presence of a basic catalyst and a cocatalyst of the group consisting of organic mercaptans and organic disulfides.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: July 27, 1976
    Assignee: Nippon Soda Company Limited
    Inventors: Tatsumi Kobayashi, Eiji Nishiwaki, Shigeharu Yamazoe, Mitsuyuki Hoshino, Sadafumi Yoshino, Katsunori Mikuma