Patents by Inventor Motoyuki Ito

Motoyuki Ito 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).

  • Disk-shaped magnetic recording medium having novel textured surface
    Patent number: 5225955
    Abstract: A novel magnetic recording medium has a texture consisting of a multiplicity of circumferential stripes which intersect the circumferential direction at an angle of 0.1.degree.-20.degree.. The friction coefficient on the surface of the medium is low and varies little among manufactured products. The medium is thus easy to start even though the surface is contacted by a magnetic head.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: July 6, 1993
    Assignee: Hitachi Metals, Ltd.
    Inventors: Motoyuki Ito, Kazuo Noda, Tadashi Shinohara
  • Thin-film hard disk magnetic medium
    Patent number: 5210673
    Abstract: A thin-film hard disk magnetic medium comprising a magnetic recording film made from a magnetic metal alloy formed on a circumferentially textured surface of a substrate, in order that the surface of the magnetic recording layer is provided with a surface roughness, Rmax of 100 .ANG. to 400 .ANG., and adjacent grooves form a space of 0.5 .mu.m to 3 .mu.m measured in the radial direction of the substrate.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: May 11, 1993
    Assignee: Hitachi Metals, Ltd.
    Inventors: Motoyuki Ito, Tadashi Shinohara