Patents by Inventor Naotaka Kamiya

Naotaka Kamiya 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: 7261844
    Abstract: A photochromic contact lens having a period of time for discoloring the contact lens from a colored state to the uncolored state shortened, wherein the photochromic contact lens is made of an oxygen-permeable polymer material having a second-order transition point of not higher than 110° C., and formed to have an oxygen permeation coefficient of not less than 50, and wherein the contact lens contains a dye capable of exhibiting photochromism.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: August 28, 2007
    Assignee: Menicon Co., Ltd.
    Inventors: Sadayasu Tanikawa, Naotaka Kamiya, Shigeyasu Nagai
  • Publication number: 20050243273
    Abstract: A photochromic contact lens having a period of time for discoloring the contact lens from a colored state to the uncolored state shortened, wherein the photochromic contact lens is made of an oxygen-permeable polymer material having a second-order transition point of not higher than 110° C., and formed to have an oxygen permeation coefficient of not less than 50, and wherein the contact lens contains a dye capable of exhibiting photochromism.
    Type: Application
    Filed: July 6, 2005
    Publication date: November 3, 2005
    Applicant: Menicon Co., Ltd.
    Inventors: Sadayasu Tanikawa, Naotaka Kamiya, Shigeyasu Nagai
  • Patent number: 5741830
    Abstract: A water-absorptive soft contact lens comprising a polymer prepared by polymerizing a monomer mixture comprising (A) a fluorine-containing styrene derivative represented by the general formula (I): ##STR1## wherein R.sup.1 is hydrogen atom or methyl group, m is an integer of 1 to 3 and n is 0 or an integer of 1 to 7, and (B) N, N-dimethyl(meth)acrylamide. The water-absorptive soft contact lens has excellent oxygen permeability, high mechanical strength and excellent flexibility independent of water content.
    Type: Grant
    Filed: February 13, 1996
    Date of Patent: April 21, 1998
    Assignee: Menicon Co., Ltd.
    Inventors: Miyuki Kamiya, Naotaka Kamiya, Noriko Iwata, Yasushi Yamamoto, Yasuo Tarumi
  • Patent number: 5041511
    Abstract: An ocular lens material, wherein a cross linking agent of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, is used.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: August 20, 1991
    Assignee: Menicon Co., Ltd.
    Inventors: Hiroaki Yanagawa, Naotaka Kamiya