Patents by Inventor Mitsuyoshi Ootake

Mitsuyoshi Ootake 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).

  • Thin film magnetic disc and method of manufacturing the disc
    Patent number: 5958542
    Abstract: A thin film magnetic disc in which dot-like scattered bumps, made of a material different from that of the protective layer, are formed on the protective layer, and a lubricant layer is formed on the surfaces of the protective layer and the scattered bumps. A protective layer excellent in strength and disk durability is obtained by using a material different from that of the bumps. The functions of the protective layer and scattered bumps are separated from each other and make full use of the different materials. Such a protective layer is effective to reduce spacing between a head and the disc.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: September 28, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuyoshi Ootake, Yuichi Kokaku, Yoshinori Honda, Akira Kato, Hiroaki Hagimae, Heigo Ishihara, Kenji Furusawa