Patents by Inventor Hideyoshi Yamaguchi

Hideyoshi Yamaguchi 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 for manufacturing forged steel roll
    Patent number: 10144057
    Abstract: A method for manufacturing a forged steel roll comprises: casting, by the ESR method, a steel ingot which contains, by mass %, C: 0.3% or more, Si: 0.2% or more, Cr: 2.0-13.0% and Mo: 0.2% or more, and further contains Bi at 10-100 ppm by mass; and forging the steel ingot to manufacture the roll. According to this method, since freckle defects can be sealed near the center of the steel ingot, the roll can be stably used over a long period of time.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: December 4, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hirofumi Onishi, Akihiro Yamanaka, Hideo Mizukami, Tomoaki Sera, Hideyoshi Yamaguchi
  • METHOD FOR MANUFACTURING FORGED STEEL ROLL
    Publication number: 20150026957
    Abstract: A method for manufacturing a forged steel roll comprises: casting, by the ESR method, a steel ingot which contains, by mass %, C: 0.3% or more, Si: 0.2% or more, Cr: 2.0-13.0% and Mo: 0.2% or more, and further contains Bi at 10-100 ppm by mass; and forging the steel ingot to manufacture the roll. According to this method, since freckle defects can be sealed near the center of the steel ingot, the roll can be stably used over a long period of time.
    Type: Application
    Filed: February 1, 2013
    Publication date: January 29, 2015
    Inventors: Hirofumi Onishi, Akihiro Yamanaka, Hideo Mizukami, Tomoaki Sera, Hideyoshi Yamaguchi