Patents by Inventor Masatake Yagi

Masatake Yagi 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).

  • STAMPER, READ-ONLY OPTICAL DISK, AND METHOD OF MAKING READ-ONLY OPTICAL DISK
    Publication number: 20080118697
    Abstract: A stamper for making a read-only optical disk includes an irregular pattern for forming embossed pits based on recording information and an irregular pattern for forming dummy irregularities. The irregular pattern for the embossed pits is arranged in a region corresponding to an information area for recording information in the read-only optical disk. The irregular pattern for the dummy irregularities is arranged in a region corresponding to an area between the information area and the outer periphery of the disk.
    Type: Application
    Filed: May 14, 2007
    Publication date: May 22, 2008
    Applicant: SONY CORPORATION
    Inventors: Hideki Takahashi, Masatake Yagi, Kiyoshi Takii, Shinji Minegishi, Shinsuke Kishi