Patents by Inventor Shigeyasu Nagai

Shigeyasu Nagai 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).

  • Photochromic contact lens having excellent discoloring characteristic
    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
  • Photochromic contact lens having excellent discoloring characteristic
    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
  • Contact lens
    Patent number: 6659607
    Abstract: Disclosed is a contact lens including an optical zone having a substantially circular shape; an peripheral zone having an annular shape and located around the optical zone; and an intermediate zone having an annular shape and located between the optical and peripheral zones. The intermediate zone including a convex portion formed in at least one radial position of a back surface thereof so as to extend in a circumferential direction thereof with an outwardly curved surface as seen in a diametrical cross-section of the lens.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: December 9, 2003
    Assignee: Menicon Co., Ltd.
    Inventors: Kazuya Miyamura, Keiji Sugimoto, Tadashi Sawano, Shigeyasu Nagai, Asaki Suzaki, Hideaki Kondo
  • Contact lens
    Publication number: 20020101563
    Abstract: Disclosed is a contact lens including an optical zone having a substantially circular shape; an peripheral zone having an annular shape and located around the optical zone; and an intermediate zone having an annular shape and located between the optical and peripheral zones. The intermediate zone including a convex portion formed in at least one radial position of a back surface thereof so as to extend in a circumferential direction thereof with an outwardly curved surface as seen in a diametrical cross-section of the lens.
    Type: Application
    Filed: January 24, 2002
    Publication date: August 1, 2002
    Applicant: MENICON CO., LTD.
    Inventors: Kazuya Miyamura, Keiji Sugimoto, Tadashi Sawano, Shigeyasu Nagai, Asaki Suzaki, Hideaki Kondo