Patents by Inventor Takashi Hatanai

Takashi Hatanai 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).

  • Recording medium for perpendicular magnetization
    Patent number: 4622273
    Abstract: A magnetic recording medium for perpendicular magnetization includes a base of a nonmagnetic material, a first magnetic layer of a soft magnetic material on a surface of the base, a second magnetic layer having perpendicular anisotropy on a surface of the first magnetic layer, the second magnetic layer being magnetized in a transverse direction thereof. The second magnetic layer is composed of a three-element alloy of cobalt, chromium, and hafnium, cobalt being a main component with chromium and hafnium added thereto.
    Type: Grant
    Filed: November 5, 1984
    Date of Patent: November 11, 1986
    Assignee: Alps Electric Co., Ltd.
    Inventors: Keishi Nakashima, Takashi Hatanai, Koichi Mukasa
  • Magnetic recording medium
    Patent number: 4609593
    Abstract: A perpendicular magnetic recording medium composed of a base material, a 1st magnetic thin layer formed on the base material, and a perpendicularly magnetizable 2nd magnetic thin layer formed on the 1st magnetic thin layer, wherein the 1st magnetic thin layer is composed of a Co-base ternary amorphous alloy containing small amounts of Hf and Ta.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: September 2, 1986
    Assignee: Alps Electric Co., Ltd.
    Inventors: Keishi Nakashima, Takashi Hatanai, Koichi Mukasa, Yutaka Shimada
  • Recording medium for perpendicular magnetization
    Patent number: 4603091
    Abstract: A magnetic recording medium for perpendicular magnetization includes a base of a nonmagnetic material, a first magnetic layer of a soft magnetic material on a surface of the base, a second magnetic layer having perpendicular anisotropy on a surface of the first magnetic layer, the second magnetic layer being magnetized in a transverse direction thereof. The second magnetic layer is composed of a three-element alloy of cobalt, chromium, and tantalum, cobalt being a main component with chromium and tantalum added thereto.
    Type: Grant
    Filed: November 5, 1984
    Date of Patent: July 29, 1986
    Assignee: Alps Electric Co., Ltd.
    Inventors: Koichi Mukasa, Takashi Hatanai, Keishi Nakashima
  • Thin-film magnetic head and composite material substrate therefor
    Patent number: 4592963
    Abstract: A composite material for use in the preparation of substrates for thin film magnetic heads is provided which comprises a carbonaceous or graphitic material strengthened with a resin or metallic binder and optionally impregnated with a resin, metallic or non-metallic impregnant.
    Type: Grant
    Filed: October 15, 1984
    Date of Patent: June 3, 1986
    Assignee: Alps Electric Co., Ltd.
    Inventors: Koichi Mukasa, Takashi Hatanai, Keishi Nakashima, Kazumasa Onishi
  • Soft magnetic material
    Patent number: 4557769
    Abstract: A soft magnetic material having a low coercive force and a high permeability without reduction in saturation magnetic flux density is composed of a Co-base Co-Hf-Ta amorphous alloy containing 1 to 5 atoms % Hf and 4 to 10 atoms % Ta. The amorphous alloy is prepared by sputtering, etc.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: December 10, 1985
    Assignee: Alps Electric Co., Ltd.
    Inventors: Yutaka Shimada, Koichi Mukasa, Takashi Hatanai, Keishi Nakashima