Patents by Inventor Takaaki Nacao

Takaaki Nacao 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 elongating optical fiber base material, and apparatus for elongating the same
    Patent number: 7854157
    Abstract: The method, in which base material ingot 1 is heated and softened in an electric furnace 3, drawn with a pair of pinch roller 6 and 6, and elongated to make base material rod 7 having a smaller diameter than the ingot, features: forming either a roller groove 11 having a curvature radius which is larger than the outer diameter of the base material rod 7 or a V-shaped roller groove 11 having the cross section consisting of straight lines on the surface of the pinch roller 6 made of metal; nipping with the facing roller grooves 11 and 11 respectively formed on the surfaces of a pair of said pinch rollers 6 and 6; and drawing said base material rod.
    Type: Grant
    Filed: January 12, 2005
    Date of Patent: December 21, 2010
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Soichiro Kemmochi, Waichi Yamamura, Takaaki Nacao, Mitsukuni Sakashita
  • Method of elongating optical fiber base material, and apparatus for elongating the same
    Publication number: 20070163302
    Abstract: The method, in which base material ingot 1 is heated and softened in an electric furnace 3, drawn with a pair of pinch roller 6 and 6, and elongated to make base material rod 7 having a smaller diameter than the ingot, features: forming either a roller groove 11 having a curvature radius which is larger than the outer diameter of the base material rod 7 or a V-shaped roller groove 11 having the cross section consisting of straight lines on the surface of the pinch roller 6 made of metal; nipping with the facing roller grooves 11 and 11 respectively formed on the surfaces of a pair of said pinch rollers 6 and 6; and drawing said base material rod.
    Type: Application
    Filed: January 12, 2005
    Publication date: July 19, 2007
    Inventors: Soichiro Kemmochi, Waichi Yamamura, Takaaki Nacao, Mitsukuni Sakashita