Patents by Inventor Syoji Nagaoka

Syoji Nagaoka 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).

  • Cross-linked n-vinyl pyrrolidone polymer composition suitable for contact lenses
    Patent number: 3949021
    Abstract: Contact lens having high water content make from polymer of cross-link-polymerized N-vinyl pyrrolidone in the presence of water-insoluble polymer has excellent properties suitable for continuous wearing for a long period of time.
    Type: Grant
    Filed: August 7, 1974
    Date of Patent: April 6, 1976
    Assignee: Toray Industries, Inc.
    Inventors: Tetsunosuke Kunitomo, Hideki Kenjo, Syoji Nagaoka, Takeshi Yoshioka, Hiroshi Tanzawa