Patents by Inventor Hirohsi Ooki

Hirohsi Ooki 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).

  • Optical disk capable of recording information on both land and groove tracks
    Patent number: 5602824
    Abstract: An optical disk has neighboring land tracks, and groove tracks for separating the land tracks. Pits each having a predetermined depth are formed on the land tracks, and islands each having a predetermined height are formed on the groove track.
    Type: Grant
    Filed: August 10, 1995
    Date of Patent: February 11, 1997
    Assignee: Nikon Corporation
    Inventors: Hirohsi Ooki, Yuwa Ishii