Patents by Inventor Totsuo Yahisa

Totsuo Yahisa 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, producing method of the same magnetic recording system
    Publication number: 20030118871
    Abstract: In a magnetic recording medium having Co-based alloy magnetic layer containing Pt formed on a substrate through an underlayer, by forming said underlayer with plural underlayers including double layer structure which is formed by piling up 1st underlayer of Cr-based alloy containing Ti and 2nd underlayer of Cr-based alloy containing at least one element selected from a group comprising Mo and W in this sequence, crystal grain diameter is decreased and then medium noise can be decreased, and c axis is oriented to in-plane direction and then high coercivity can be obtained, consequently the magnetic recording medium having high signal to noise ratio at high recording density region is obtained. Further a small size large capacity magnetic recording system can be provided by combination of said magnetic recording media with a MR (magnetoresistive) head.
    Type: Application
    Filed: September 26, 2002
    Publication date: June 26, 2003
    Inventors: Yuzuru Hosoe, Yoshibumi Matsuda, Totsuo Yahisa, Kiwamu Tanahashi, Hiroyuki Suzuki, Koji Sakamoto, Akira Kato