Patents by Inventor Yamaoka Hideyoshi

Yamaoka Hideyoshi 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 and optical recording/reproducing device
    Patent number: 7974158
    Abstract: A small-sized, large-capacity optical disk is provided which is superior in portability. The optical disk has a diameter less than 64 mm and a thickness less than 0.8 mm. Tracks are formed with a pitch less than 0.6 ?m, and the record area is divided into a plurality of zones alone the radium. The optical disk can store more than 650 MB of compressed data.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: July 5, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takahashi Akira, Terashima Shigeo, Yamaoka Hideyoshi