Patents by Inventor Shoichiro Kanouchi

Shoichiro Kanouchi 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).

  • Process for fabricating a magnetic disk substrate
    Patent number: 6256860
    Abstract: It is an object of the present invention to provide a magnetic hard disk substrate having an excellent surface flatness. According to the present invention, there is provided the magnetic hard disk substrate and a process of fabricating the substrate in which an aluminum alloy blank, before an Ni-P plating treatment, is subjected to precision turning, with a stock removal on each surface in the range of 20 to 150 &mgr;m in depth, followed by grinding, with a stock removal on each surface of 10 &mgr;m or less in depth.
    Type: Grant
    Filed: May 6, 1998
    Date of Patent: July 10, 2001
    Assignee: Showa Denko K. K.
    Inventors: Hiromichi Matsubara, Shoichiro Kanouchi