Patents by Inventor Kiyoshi Tsuboi, deceased

Kiyoshi Tsuboi, deceased 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 memory for storing and retrieving information by light exposure
    Patent number: 4969141
    Abstract: An optical disc memory for optically storing and retrieving information formed of a substrate and a recording layer supported on the substrate. The recording layer has a chemically stable dielectric material and a semiconductor which has an optical property that changes reversibly as a function of the intensity of a laser beam applied through the substrate. A multilayered optical disc memory having a substrate, a recording layer formed on the substrate and a metallic layer formed on the recording layer, and a method of optically storing and retrieving information by using the above-described optical disc memory, are also disclosed.
    Type: Grant
    Filed: April 18, 1989
    Date of Patent: November 6, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Takaoka, Kiyoshi Tsuboi, deceased