Patents by Inventor Chizuko Wakabayashi

Chizuko Wakabayashi 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).

  • Magnetic head using specified Fe Ta N Cu or Fe Ta N Ag alloy film
    Patent number: 5475554
    Abstract: A magnetic head includes a magnetic alloy material suitable for high density recording having a composition of (Fe.sub.x M.sub.y N.sub.z).sub.a L.sub.b, where L is Cu and/or Ag. The provision of Cu and/or Ag in a range from 0.5 to 5.0 at % enhances the thermal stability of the soft magnetic properties of the head.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: December 12, 1995
    Assignee: NEC Corporation
    Inventors: Nobuyuki Ishiwata, Chizuko Wakabayashi
  • Magnetic alloy consisting of a specified FeTaN Ag or FeTaNCu composition
    Patent number: 5304258
    Abstract: A magnetic alloy film suitable for high density recording has a composition of (Fe.sub.x M.sub.y N.sub.z).sub.a L.sub.b, where L is Cu and/or Ag. The provision of Cu and/or Ag in a range from 0.5 to 5 atomic % enhances thermal stability of the soft magnet properties of the alloy.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: April 19, 1994
    Assignee: NEC Corporation
    Inventors: Nobuyuki Ishiwata, Chizuko Wakabayashi
  • Magneto-optical disk with perpendicular magnetic anisotropy film and high corrosion-resistant film
    Patent number: 4980875
    Abstract: A Magneto-Optical disk having a transparent substrate, a Magneto-Optical film formed on the transparent substrate and a high corrosion-resistant film laminated on the Magneto-Optical film. The Magneto-Optical film is made of a perpendicular magnetic anisotropy material, the corrosion-resistant film is made of a metal or metal alloy. A foundation protecting layer may be formed on the transparent substrate with the Magneto-Optical film and the corrosion resistant film formed thereon. The Magneto-Optical film may be a plurality of films laminated alternately with a plurality of corrosion-resistant films.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: December 25, 1990
    Assignee: NEC Home Electronics Ltd.
    Inventors: Nobuyuki Ishiwata, Chizuko Wakabayashi, Takayuki Matsumoto, Toshiyuki Okumura, Junichi Homma, Susumu Ito