Patents by Inventor Toshikatu Narumi

Toshikatu Narumi 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).

  • Longitudinal magnetic coated recording medium
    Patent number: 4822634
    Abstract: A longitudinal magnetic coated recording medium includes at least planar magnetic particles, each having an easy magnetization axis perpendicular to the planar surface thereof, preferably mixed with other particles, and dispersed in a magnetic film formed on a nonmagnetic substrate, having a orientation angle of -30.degree. to +30.degree.. A process for producing such a recording medium includes the step of orienting the planar magnetic particles by applying a magnetic field approximately in parallel to the surface of the magnetic film.
    Type: Grant
    Filed: April 17, 1987
    Date of Patent: April 18, 1989
    Assignee: Fujitsu Limited
    Inventors: Jun Takahashi, Shigeru Fukushima, Toshikatu Narumi, Ken-ich Itoh, Seiya Ogawa
  • Longitudinal magnetic coated recording medium
    Patent number: 4746569
    Abstract: A longitudinal magnetic coated recording medium comprises at least plane magnetic particles each having an easy magnetization axis perpendicular to the major surface thereof, preferably mixed with other particles, and dispersed in a magnetic film formed on a nonmagnetic substrate, having a orientation angle of -30.degree. to +30.degree.. A process for producing such a recording medium comprises the step of orienting the plane magnetic particles by applying at least a magnetic field approximately in parallel to the surface of the magnetic film.
    Type: Grant
    Filed: May 14, 1986
    Date of Patent: May 24, 1988
    Assignee: Fujitsu Limited
    Inventors: Jun Takahashi, Shigeru Fukushima, Toshikatu Narumi, Ken-ichi Itoh, Seiya Ogawa