Patents by Inventor Shuji Okagawa

Shuji Okagawa 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).

  • Method of producing an elliptic core optical fiber
    Patent number: 6948340
    Abstract: Disclosed is a method of producing an elliptic core optical fiber, in which a original preform having a circular core disposed at the center of a circular clad is processed to flatten on its periphery to form a processed preform that is then drawn with heating into an elliptic core optical fiber. According to the invention, the form of the processed preform used for producing an elliptic core optical fiber with desired specific dimensions can be designed using pre-obtained correlations based on the dimensions of the elliptic core optical fiber. If the processed preform designed like this is drawn with heating, an elliptic core optical fiber with desired specific dimensions can be reliably and easily produced.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: September 27, 2005
    Assignee: Moritex Corporation
    Inventors: Shuji Okagawa, Hideo Kato, Kenji Yagi
  • Method of producing an elliptic core optical fiber, and a processed preform used for producing elliptic core optical fiber
    Publication number: 20020162361
    Abstract: Disclosed is a method of producing an elliptic core optical fiber, in which a original preform having a circular core disposed at the center of a circular clad is processed to flatten on its periphery to form a processed preform that is then drawn with heating into an elliptic core optical fiber.
    Type: Application
    Filed: March 15, 2002
    Publication date: November 7, 2002
    Inventors: Shuji Okagawa, Hideo Kato, Kenji Yagi
  • UV-curable resin compositions
    Patent number: 4902440
    Abstract: A UV-curable resin composition, which comprises blending urethane acrylate with tris(2-acryloxyethyl)isocyanurate, or with tris(2-acryloxyethyl)isocyanurate and with diacrylate, which composition has a low viscosity and a good drawing workability before curing and cures rapidly by ultraviolet radiation to give cured products having a high elastic modulus, a high elongation and a low water-absorption.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: February 20, 1990
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Hidekazu Takeyama, Yoshinobu Ohashi, Shuji Okagawa, Masayuki Nishimoto, Masao Nishimura