Patents by Inventor Seiich Asada

Seiich Asada 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: 3956152
    Abstract: A magnetic recording medium or composition which comprises a ferromagnetic chromium dioxide product containing a proper quantity of tungsten alone or admixed with a member selected from the group consisting of copper and zinc, which has an excellent ferromagnetic characteristic of high coercive force.
    Type: Grant
    Filed: October 23, 1973
    Date of Patent: May 11, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Seiich Asada, Masahiro Amemiya, Michiharu Seki