Patents by Inventor Yoshiuki Tagashira

Yoshiuki Tagashira 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).

  • Perpendicular magnetic recording medium and magnetic recording device using the same
    Patent number: 5863631
    Abstract: A perpendicular magnetic recording medium wherein a perpendicular magnetic film is formed on a substrate or a nonmagnetic film, and the perpendicular magnetic film contains Co and Cr, the content of the Cr being 22 at. % or higher but 30 at. % or less. The medium is used in a magnetic recording disk drive using a magnetoresistive read head.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: January 26, 1999
    Assignee: International Business Machines Corporation
    Inventors: Yoshiaki Sonobe, Yoshihiro Ikeda, Hiroshi Uchida, Takashi Toyooka, Yoshiuki Tagashira