Patents by Inventor Noyasu Miyagawa

Noyasu Miyagawa 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 recording and reproducing apparatus
    Patent number: 5568461
    Abstract: An optical information recording and reproducing apparatus for recording and reproducing an information signal on/from both concave portions and convex portions of guide grooves formed on a recording medium is disclosed.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: October 22, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenichi Nishiuchi, Noyasu Miyagawa, Eiji Ohno, Nobuo Akahira