Patents Examined by Leszek Killman, PHD
  • Magnetic recording medium and its manufacturing method
    Patent number: 5637393
    Abstract: A magnetic recording medium comprising a non-magnetic substrate, a ferromagnetic thin film on the non-magnetic substrate, a hard carbon film on the ferromagnetic thin film, a modified layer of which atomic ratio of nitrogen/carbon is 0.8% or more, and of which thickness is less than 3 nm on the hard carbon film, and a lubricant layer on the modified layer, has excellent electromagnetic conversion characteristic, running stability, durability, and weatherability.
    Type: Grant
    Filed: July 23, 1993
    Date of Patent: June 10, 1997
    Assignee: Matsuhita Electric Industrial Co., Ltd.
    Inventors: Hideyuki Ueda, Kenji Kuwahara, Hiroshi Seki, Kiyoshi Takahashi, Masaru Odagiri, Mikio Murai, Yukikazu Ohchi