Patents by Inventor Seiichi Yoshimoto

Seiichi Yoshimoto 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).

  • Plastic lens
    Patent number: 4528351
    Abstract: A plastic lens of a stepped segment having an excellent surface hardness can be obtained at high molding efficiency from cast polymerization of a diethylene glycol bisallyl carbonate and specified acrylate(s) system further added with a specified diacrylate(s) and/or dimethacrylate(s).
    Type: Grant
    Filed: July 22, 1982
    Date of Patent: July 9, 1985
    Assignee: Hoya Lens Corporation
    Inventors: Niro Tarumi, Yoichi Okubo, Seiichi Yoshimoto