Patents by Inventor Hiroyuki Kako

Hiroyuki Kako 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).

  • Water-absorptive contact lenses
    Patent number: 4547543
    Abstract: A water-absorptive contact lens made of a copolymer consisting essentially of:(a) from about 50 to about 95 parts, by weight of the total monomer units, of hydrophilic monomer units consisting essentially of from about 25 to 100 parts, by weight of the total hydrophilic monomer units, of N-methyl-3-methylene-2-pyrrolidone represented by the formula: ##STR1## and from 0 to about 75 parts, by weight of the total hydrophilic monomer units, of N-vinyl-2-pyrrolidone; and(b) from about 5 to about 50 parts, by weight of the total monomer units, of reinforcing monomer units consisting essentially of at least one monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, styrene, alkyl styrenes, benzyl acrylate and benzyl methacrylate.
    Type: Grant
    Filed: November 8, 1984
    Date of Patent: October 15, 1985
    Assignee: Toyo Contact Lens Co., Ltd.
    Inventors: Takanori Shibata, Masashige Yamanaka, Hiroyuki Kako