Patents by Inventor Yasuomi Sasai

Yasuomi Sasai 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).

  • Patent number: 4745158
    Abstract: A highly water-absorptive optical material obtained by saponification for hydrophilic treatment of a copolymer composed essentially of:(A) from 2 to 30 parts by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolmerizing (a) at alkyl (meth)acrylate monomer and (b) a monomer having at least two polymerizable groups per molecule, as the main components, and(B) from 70 to 98% by weight of a fatty acid vinyl ester.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: May 17, 1988
    Assignee: Toyo Contact Lens Co., Ltd.
    Inventors: Tatsutoshi Nakashima, Nobuyuki Toyoshima, Yasuomi Sasai