Patents by Inventor Masahide Takagi

Masahide Takagi 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).

  • Depression-provided steel pipe and composite pile
    Patent number: 9062432
    Abstract: This depression-provided steel pipe has plural depressions on an outer peripheral surface, the depressions being formed so as to form a line along an axial direction of the steel pipe, in which each of the depressed portions has, inside thereof, a columnar groove portion extending along the axial direction of the steel pipe and depressed deeper than a bottom surface of these depressed portions; 0.95?HA/HB?1.05 is satisfied, where HA is an average Vickers hardness in each of the depressed portions, and HB is a Vickers hardness at a portion between the depressed portions adjacent to each other in the axial direction of the steel pipe; and the outer peripheral surface is covered with a mill scale.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: June 23, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masahide Takagi, Shinji Taenaka, Tetsu Satoh, Yuki Motegi, Takashi Oosawa
  • DEPRESSION-PROVIDED STEEL PIPE AND COMPOSITE PILE
    Publication number: 20130309023
    Abstract: This depression-provided steel pipe has plural depressions on an outer peripheral surface, the depressions being formed so as to form a line along an axial direction of the steel pipe, in which each of the depressed portions has, inside thereof, a columnar groove portion extending along the axial direction of the steel pipe and depressed deeper than a bottom surface of these depressed portions; 0.95?HA/HB?1.05 is satisfied, where HA is an average Vickers hardness in each of the depressed portions, and HB is a Vickers hardness at a portion between the depressed portions adjacent to each other in the axial direction of the steel pipe; and the outer peripheral surface is covered with a mill scale.
    Type: Application
    Filed: February 22, 2012
    Publication date: November 21, 2013
    Inventors: Masahide Takagi, Shinji Taenaka, Tetsu Satoh, Yuki Motegi, Takashi Oosawa
  • Dimpled steel pipe
    Patent number: D661381
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: June 5, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Yuki Motegi, Masahide Takagi, Takashi Oosawa, Tetsu Satoh
  • Dimpled steel pipe
    Patent number: D669160
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: October 16, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Yuki Motegi, Masahide Takagi, Takashi Oosawa, Tetsu Satoh
  • Dimpled steel pipe
    Patent number: D669970
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: October 30, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Yuki Motegi, Masahide Takagi, Takashi Oosawa, Tetsu Satoh