Patents by Inventor Kayoko Oishi

Kayoko Oishi 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).

  • Magneto-optical recording medium having a reflective film of Ag and Mn or Ag, Mn and Sn
    Patent number: 5040166
    Abstract: The present invention relates to magneto-optical recording medium. The recording medium comprises a magnetic film and a reflective film both provided on a substrate. The reflective film comprises silver (Ag) and manganese (Mn) or silver (Ag), manganese (Mn) and tin (Sn). The magneto-optical recording medium gives excellent CN ratio and recording sensitivity.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: August 13, 1991
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Masanobu Kobayashi, Yoshinori Maeno, Kayoko Oishi
  • Magneto-optical recording medium having protective film with increased kerr effect and improved protection characteristic and manufacturing method of the same
    Patent number: 5009762
    Abstract: A magneto-optical recording medium includes one selected from a compound of strontium titanate (SrTiOx), a compound of barium titanate (BaTiOx), a nitrogen compound of strontium titanate (SrTiOxNy), and a nitrogen compound of barium titanate (BaTiOxNy). The magneto-optical recording medium has a large value for the refractive index n and a small value for the extinction coefficient k; moreover, the medium is resistive against corrosions. For the magneto-optical recording medium, there is produced a protective film by simultaneously sputtering a film forming target and a composition adjusting target. The deposition of the protective film is achieved in a mixed atmosphere of an inert gas and oxygen or in a mixed gas of an inert gas and nitrogen.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: April 23, 1991
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yoshinori Maeno, Masanobu Kobayashi, Kayoko Oishi
  • Magneto-optical recording medium having protective film with increased Kerr effect and improved protection characteristic and manufacturing method of the same
    Patent number: 4950547
    Abstract: A magneto-optical recording medium includes one selected from a compound of strontium titanate (SrTiOx), a compound of barium titanate (BaTiOx), a nitrogen compound of strontium titanate (SrTiOxNy), and a nitrogen compound of barium titanate (BaTiOxNy). The magneto-optical recording medium has a large value for the refractive index n and a small value for the extinction coefficient k; moreover, the medium is resistive against corrosions. For the magneto-optical recording medium, there is produced a protective film by simultaneously sputtering a film forming target and a composition adjusting target. The deposition of the protective film is achieved in a mixed atmosphere of an inert gas and oxygen or in a mixed gas of an inert gas and nitrogen.
    Type: Grant
    Filed: July 7, 1989
    Date of Patent: August 21, 1990
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yoshinori Maeno, Masanobu Kobayashi, Kayoko Oishi