Patents by Inventor Kyohei Sonoyama

Kyohei Sonoyama 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).

  • Pearlite rail
    Patent number: 8361246
    Abstract: A pearlite rail contains, by mass %, 0.65 to 1.20% of C; 0.05 to 2.00% of Si; 0.05 to 2.00% of Mn; and the balance composed of Fe and inevitable impurities, wherein at least part of the head portion and at least part of the bottom portion has a pearlite structure, and the surface hardness of a portion of the pearlite structure is in a range of Hv320 to Hv500 and a maximum surface roughness of a portion of the pearlite structure is less than or equal to 180 ?m.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: January 29, 2013
    Assignee: Nippon Steel Corporation
    Inventors: Masaharu Ueda, Kyohei Sonoyama, Takuya Tanahashi, Teruhisa Miyazaki, Katsuya Iwano
  • PEARLITE RAIL
    Publication number: 20110226389
    Abstract: A pearlite rail contains, by mass %, 0.65 to 1.20% of C; 0.05 to 2.00% of Si; 0.05 to 2.00% of Mn; and the balance composed of Fe and inevitable impurities, wherein at least part of the head portion and at least part of the bottom portion has a pearlite structure, and the surface hardness of a portion of the pearlite structure is in a range of Hv320 to Hv500 and a maximum surface roughness of a portion of the pearlite structure is less than or equal to 180 ?m.
    Type: Application
    Filed: August 13, 2010
    Publication date: September 22, 2011
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masaharu Ueda, Kyohei Sonoyama, Takuya Tanahashi, Teruhisa Miyazaki, Katsuya Iwano