Patents Examined by Zroy King
  • Railway car wheel
    Patent number: 7566372
    Abstract: A railway car wheel comprises a rim having a flange and a tread portion. The tread portion contains 0.35-0.55% C and has a Vickers hardness of at least 360 and comprises a bainite structure, a tempered martensite structure, or a mixture of both.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: July 28, 2009
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Takanori Kato, Masahide Umino, Tomoaki Yamamoto