Patents by Inventor Rohit Ishizaki

Rohit Ishizaki 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).

  • Zone texturing method for a magnetic recording disk
    Patent number: 5447746
    Abstract: A magnetic recording disk is zone-textured by using two or more tubular needles with outlets opening to its surface. While the disk is rotated around its center axis, different coating materials such as solutions containing and not containing colloidal silica are passed through these needles and deposited through their outlets inside different zones on the disk surface. The needles are moved such that the radial distances of their outlets from the disk center vary within certain ranges corresponding to different zones such as the data and landing zones on the disk surface.
    Type: Grant
    Filed: November 18, 1994
    Date of Patent: September 5, 1995
    Assignee: Hoya Corporation USA
    Inventors: Rohit Ishizaki, Akinori Kurikawa, Rohit Narendra