Patents by Inventor Yasuharu Tahaka

Yasuharu Tahaka 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 formed from styrene monomer containing a silyl or siloxane group
    Patent number: 4594401
    Abstract: An oxygen permeable hard contact lens having an improved oxygen permeability and an improved hardness and rigidity and an improved refractive index, made of a polymer comprising a styrene containing a silyl or siloxanyl group having at most 15 silicon atoms.
    Type: Grant
    Filed: December 27, 1984
    Date of Patent: June 10, 1986
    Assignees: Shin-Etsu Chemical Co., Ltd., Toyo Contact Lens Co., Ltd.
    Inventors: Kozo Takahashi, Yasuharu Tahaka, Kenichi Isobe, Shoji Ichinohe