Patents by Inventor Toshiaki Shigematsu

Toshiaki Shigematsu 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).

  • Apparatus for manufacturing oxygen-free copper
    Patent number: 5143355
    Abstract: Method and apparatus for manufacturing an oxygen-free copper having an oxygen content of no greater than 3 ppm by weight are disclosed. In the method, a deoxidizing step is carried out by bringing a reducing gas containing hydrogen gas into contact with a molten copper to react on the oxygen to remove the same. Then a dehydrogenation step may be carried out by bringing a gas of lean hydrogen concentration into contact with the molten copper. Accordingly, the apparatus has a deoxidizing device for blowing the reducing gas into the molten copper and preferably a dehydrogenation device.
    Type: Grant
    Filed: June 5, 1991
    Date of Patent: September 1, 1992
    Assignee: Mitsubishi Materials Corporation
    Inventors: Takuro Iwamura, Tsugio Koya, Izumi Sukekawa, Hideru Hagiwara, Haruhiko Asao, Toshiaki Shigematsu, Hideki Sato
  • Method for manufacturing oxygen-free copper
    Patent number: 5037471
    Abstract: Method and apparatus for manufacturing an oxygen-free copper having an oxygen content of no greater than 3 ppm by weight are disclosed. In the method, a deoxidizing step is carried out by bringing a reducing gas containing hydrogen gas into contact with a molten copper to react to the oxygen to remove the same. Then a dehydrogenation step may be carried out by bringing a gas of lean hydrogen concentration into contact with the molten copper. Accordingly, the apparatus has a deoxidizing device for blowing the reducing gas into the molten copper and preferably a dehydrogenation device.
    Type: Grant
    Filed: November 21, 1989
    Date of Patent: August 6, 1991
    Assignee: Mitsubishi Metal Corporation
    Inventors: Takuro Iwamura, Tsugio Koya, Izumi Sukekawa, Hideru Hagiwara, Haruhiko Asao, Toshiaki Shigematsu, Hideki Sato