Patents Assigned to Nippon Contact Lens Manufacturing Ltd.
  • Patent number: 4602074
    Abstract: A contact lens material made of an organosiloxane ester copolymer. The organosiloxane is represented by the general formula: ##STR1## and the ester is composed of C.sub.1 -C.sub.10 mono- or multi-valent alcohol and methacrylic acid, acrylic acid or itaconic acid. The contact lens is oxygen permeable and substantially free of water-absorption, so that it is easy to handle. It may be worn comfortably for extended period.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: July 22, 1986
    Assignee: Nippon Contact Lens Manufacturing Ltd.
    Inventors: Yutaka Mizutani, Tatsuo Harata, Naokatsu Tanahashi
  • Patent number: 4285890
    Abstract: A method for manufacturing silicone lenses by use of a mold of specific structure is provided. The mold comprises a male section and a female section each of which has a mold surface plated with chromium, hard chromium or nickel. Both sections when joined together come into line contact with each other to define a mold cavity therebetween. With this type of mold, the method of the present invention is carried out in such a manner that a silicone resin material is cast into the mold cavity and the mold is heated in hot water until the material is cured. The cured material makes itself a finished contact lens of excellent quality.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: August 25, 1981
    Assignee: Nippon Contact Lens Manufacturing Ltd.
    Inventors: Yutaka Mizutani, Yoshiharu Miwa, Mitsuru Oshima
  • Patent number: 4138086
    Abstract: A mold for manufacturing silicone contact lenses is provided. The mold comprises a male section and a female section plated with chromium or nickel which when joined together come into contact with each other only at a portion at which the mold surface of one section becomes continuous with that of the other section to define a cavity therebetween. The contact between both sections is not in a flat-to-flat fashion but in a line or edge-to-edge fashion so that a contact lens whose surface and edge are completely freed from flashes or irregularities can be obtained. Further, with the use of chromium or nickel plated mold of the present invention, a contact lens of excellent quality can be obtained from a silicone resin which is affinitive to chromium and nickel.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: February 6, 1979
    Assignee: Nippon Contact Lens Manufacturing Ltd.
    Inventors: Yutaka Mizutani, Yoshiharu Miwa, Mitsuru Oshima