Patents by Inventor Shigeharu Onozuka

Shigeharu Onozuka 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).

  • Oxygen-permeable hard contact lens material with excellent impact resistance
    Patent number: 5023305
    Abstract: A copolymer composed mainly of at least one monomer component selected from fluorine-containing (meth)acrylates and silicone-containing (meth)acrylates and a siloxane oligomer having a polymerizable functional group at the molecular terminals is useful as an oxygen-permeable hard contact lens material with excellent impact resistance.
    Type: Grant
    Filed: March 7, 1990
    Date of Patent: June 11, 1991
    Assignee: Hoya Corporation
    Inventors: Shigeharu Onozuka, Yuuichi Yokoyama, Makoto Tsuchiya