Patents by Inventor Syuichi Ohkubo

Syuichi Ohkubo 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).

  • Single-substrate multi-layer optical disk for read-only storage and phase change rewritable storage
    Patent number: 5708653
    Abstract: An optical disk includes a transparent rigid substrate, a phase change rewritable optical recording medium formed on the transparent rigid substrate, a transparent spacer formed on the phase change rewritable optical recording medium and having a grooved surface for storing information, and a reflecting layer formed on the grooved surface of the transparent spacer. The grooved surface of the transparent spacer and the reflecting layer form a read-only recording medium.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: January 13, 1998
    Assignee: NEC Corporation
    Inventors: Mitsuya Okada, Syuichi Ohkubo