Patents by Inventor Naotake Ebinuma

Naotake Ebinuma 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 information medium with sample mark area and multiple transcription prevention
    Patent number: 4991163
    Abstract: An optical disc consists of a base plate, a reflective thin layer, and a protective thin layer. The optical disc has a sample mark area having two sample marks, one of which is off-set on one side of a track, another of which is off-set at an opposite side of a track. These sample marks are produced by an injection molding with replica technique. At the time of the injection molding, additional pressure moves soft injected plastic resin, which causes double transcription of the sample marks. For preventing the double transcription, groove areas are provided on opposite sides of the sample mark area. The groove areas provide an anchor effect at the time of injection molding.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: February 5, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Nobuhiro Tokushuku, Hitoshi Yanagihara, Katashi Hazama, Masaki Yoshii, Naotake Ebinuma