Patents by Inventor Hitoshi TSUBAKIYAMA

Hitoshi TSUBAKIYAMA 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 inspecting ultraviolet curable resin for optical fiber and method of manufacturing optical fiber
    Patent number: 10852222
    Abstract: A method of inspecting a degree of air bubbles which are mixed into an ultraviolet curable resin for an optical fiber having viscosity of 1.2 Pa·s to 6.2 Pa·s at a temperature of 25±5° C., is performed in such a manner that the ultraviolet curable resin for an optical fiber which is an inspecting target is put into a sealed apparatus, then the inside of the sealed apparatus is decompressed to be a predetermined pressure, and then the sealed apparatus is left to stand as it is for a predetermined time. If a ratio of the volume expansion of the ultraviolet curable resin for an optical fiber is equal to or less than a predetermined threshold, the ultraviolet curable resin for an optical fiber is recognized as an accepted product.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: December 1, 2020
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Akihisa Yamaguchi, Masayuki Kato, Hitoshi Tsubakiyama
  • METHOD OF INSPECTING ULTRAVIOLET CURABLE RESIN FOR OPTICAL FIBER AND METHOD OF MANUFACTURING OPTICAL FIBER
    Publication number: 20160282250
    Abstract: A method of inspecting a degree of air bubbles which are mixed into an ultraviolet curable resin for an optical fiber having viscosity of 1.2 Pa·s to 6.2 Pa·s at a temperature of 25±5° C., is performed in such a manner that the ultraviolet curable resin for an optical fiber which is an inspecting target is put into a sealed apparatus, then the inside of the sealed apparatus is decompressed to be a predetermined pressure, and then the sealed apparatus is left to stand as it is for a predetermined time. If a ratio of the volume expansion of the ultraviolet curable resin for an optical fiber is equal to or less than a predetermined threshold, the ultraviolet curable resin for an optical fiber is recognized as an accepted product.
    Type: Application
    Filed: March 23, 2016
    Publication date: September 29, 2016
    Inventors: Akihisa YAMAGUCHI, Masayuki KATO, Hitoshi TSUBAKIYAMA