Patents by Inventor Kazuhiro Fujise

Kazuhiro Fujise 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 disk having CSS area with concave and convex portions and apparatus containing the same
    Patent number: 5930091
    Abstract: In order to provide a magnetic disk apparatus and a magnetic disk which is excellent in reliability and durability, and which enables high density recording, respectively, this invention provides a method for forming fine concave and convex portions (uneven area) on the magnetic disk by coating masking material particles only in the CSS area on the magnetic disk, etching the magnetic disk, and removing the masking material particles.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: July 27, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Ono, Yoshishige Endo, Hiroshi Matsumoto, Yoshihiro Moriguchi, Noriyuki Shige, Kazuhiro Fujise