Patents by Inventor Tsukasa Kanazawa

Tsukasa Kanazawa 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).

  • Method for recording data on non-defective sectors of an optical disk
    Patent number: 4839879
    Abstract: An optical disc is subdivided into a plurality of concentric tracks. The tracks are further subdivided into a plurality of sectors. A method for recording data on such an optical disc includes the steps of designating some of the sectors as preliminary sectors and the remaining sectors as user sectors, identifying defective user sectors, and recording data corresponding to the defective sectors on the preliminary sectors.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: June 13, 1989
    Assignee: Matsushita Graphic Communication Systems, Inc.
    Inventors: Kaname Sawada, Kazuo Suzuki, Shinji Hasunuma, Eizo Katayama, Motoyasu Ohno, Tsukasa Kanazawa, Keiji Ueki