Patents by Inventor Masaaki Fujiyana

Masaaki Fujiyana 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 medium
    Patent number: 4425400
    Abstract: In a magnetic recording medium comprising a magnetic recording layer on the surface of a non-magnetic support member, an abrasive having a Mohs' hardness of at least 6 and needle-shaped .alpha.-Fe.sub.2 O.sub.3 are incorporated in the magnetic layer, thus improving the coating durability and decreasing the head abrasion, jitter and noise.
    Type: Grant
    Filed: March 31, 1982
    Date of Patent: January 10, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Yamaguchi, Masaaki Fujiyana, Nobuo Tsuji, Norio Nasu