Patents by Inventor Toshihisa Okamura

Toshihisa Okamura 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 recording media
    Patent number: 4748090
    Abstract: A magnetic recording medium is described, comprising a non-magnetic support base having positioned thereon a magnetic layer and optionally a non-magnetic layer, wherein at least one layer of the magnetic and non-magnetic layers contains an oxyfatty acid ester. This recording medium has superior surface properties and thus superior running properties, and can be satisfactorily used in tape decks.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: May 31, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuyuki Yamamoto, Katsumi Ryoke, Nobuo Tsuji, Yuzo Higaki, Toshihisa Okamura
  • Magnetic recording media
    Patent number: 4554220
    Abstract: A magnetic recording medium is described, comprising a non-magnetic support base having positioned thereon a magnetic layer and optionally a non-magnetic layer, wherein at least one layer of the magnetic and non-magnetic layers contains an ester derived from pentaerythritol and/or its condensate and a fatty acid and/or a resin acid. This recording medium has superior surface properties and can be satisfactorily used in tape decks.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: November 19, 1985
    Assignees: Fuji Photo Film Co., Ltd., Nisshin Oil Mills, Ltd.
    Inventors: Nobuyuki Yamamoto, Katsumi Ryoke, Nobuo Tsuji, Yuzo Higaki, Toshihisa Okamura
  • Magnetic recording media with oxyfatty acid lubricant
    Patent number: 4548873
    Abstract: A magnetic recording medium is disclosed. The medium is comprised of a support and a magnetic layer provided thereon wherein an oxyfatty acid is incorporated in the magnetic layer or in the surface of a support or layer coming into contact with the magnetic layer. The coefficients of friction of the magnetic layer with parts of a magnetic recording/reproducing deck are low and thus the magnetic recording medium has superior lubricity.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: October 22, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuyuki Yamamoto, Yoshito Mukaida, Nobuo Tsuji, Yuzo Higaki, Toshihisa Okamura