Patents by Inventor Shuich Yanagisawa

Shuich Yanagisawa 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 record disk
    Patent number: 4812857
    Abstract: The structure of an annular spacer adapted to be sandwiched between a pair of circular base plates in an optical information record disk of the air sandwiching type.The annular spacer has an annular groove having a flattened bottom which groove is formed on each of opposite faces of the annular spacer on which circular base plates are carried in order to allow layers of a bonding agent between the circular base plates and the spacer to have a sufficient thickness required for adhesion between them.
    Type: Grant
    Filed: October 23, 1987
    Date of Patent: March 14, 1989
    Assignee: Pioneer Electronic Corporation
    Inventors: Yasushi Murata, Shuich Yanagisawa