Patents Assigned to NGK Spark Plug CP. Ltd.
  • Method of producing sintered hard metal with diamond film
    Patent number: 5028451
    Abstract: The present invention is directed to a method of producing a sintered hard metal having a diamond film wherein a gas that is obtained by activating a raw material gas containing 2 to 60 mol % of carbon monoxide and hydrogen gas is brought in contact with a sintered hard metal to form a diamond film, thereby a diamond film can be formed on said sintered hard metal with the adhesion of the diamond excellent.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: July 2, 1991
    Assignees: Idemitsu Petrochemical Company Limited, NGK Spark Plug CP. Ltd.
    Inventors: Toshimichi Ito, Satoshi Katsumata, Masakazu Watanabe, Satoshi Iio