Patents by Inventor Shigehiko Fujimaki

Shigehiko Fujimaki 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).

  • Patent number: 5409738
    Abstract: Disclosed are a recording medium comprising a substrate, a thin film for recording formed on at least one side of the substrate, a protective layer formed on the thin film, and a lubricative film formed on the protective layer, the lubricative film comprising an oxidative polymerization product having main molecular chains chemically bonded to the protective film; and a process for producing the recording medium. This recording medium is excellent in lubricity and durability, and the layers formed thereon can be very thin.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: April 25, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Matsunuma, Yuichi Kokaku, Makoto Kitoh, Shigehiko Fujimaki
  • Patent number: 5104709
    Abstract: The magnetic recording medium of the present invention comprises(a) a non-magnetic substrate,(b) a magnetic recording layer containing at least one ferromagnetic substance on at least one side of the substrate,(c) a protective layer the magnetic recording layer, and(d) a lubricant layer on the protective layer, wherein an adhesion-strengthening substance which is at least one member selected from the group consisting of metals and metal compounds is distributed substantially uniformly on the layer (c) at the interface between the layer (c) and the layer (d) so as not to cover the whole surface of the layer (c) and so as to contact also with the layer (d).
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: April 14, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Yuichi Kokaku, Satoshi Matsunuma, Shigehiko Fujimaki, Makoto Kitoh, Kenji Furusawa