Patents by Inventor Noriaki Yamagata

Noriaki Yamagata 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).

  • Method of producing recording media and its apparatus
    Patent number: 5244554
    Abstract: A method of producing recording media which comprises steps of arranging substrates for recording media on a carrier which is purified by etching with a plasma state gas; and forming a plurality of sputtered layers on the substrates.An apparatus for producing recording media which comprises a sputtering chamber which forms a recording layer; and a treatment chamber which precedes the sputtering chamber, and in which a carrier to be arranged with substrates for the recording media is purified by a plasma state gas.
    Type: Grant
    Filed: June 18, 1991
    Date of Patent: September 14, 1993
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Noriaki Yamagata, Nobuyuki Yoshino, Shuichi Hirai