Patents by Inventor Yorikatsu Hohokabe

Yorikatsu Hohokabe 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: 4342863
    Abstract: A plastic lens composed of a cured product of a mixture or a reaction produce of (A) a compound containing at least 2 unsaturated cycloacetal groups per molecule, (B) a compound containing at least 2 mercapto groups per molecule and (D) an aliphatic polyvinyl compound selected from the group consisting of ethylene glycol diacrylate, ethylene glycol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol tetraacrylate and dipentaerythritol hexaacrylate.
    Type: Grant
    Filed: February 12, 1981
    Date of Patent: August 3, 1982
    Assignees: Showa Denko K.K., Showa Highpolymer Co., Ltd.
    Inventors: Yorikatsu Hohokabe, Eiichiro Takiyama