Patents by Inventor Yeong-Jun Kwon

Yeong-Jun Kwon 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 an ultra-highstrength steel bar
    Patent number: 9200353
    Abstract: This invention relates to an ultra-high-strength steel bar and to a method of manufacturing the same, in which the steel bar includes C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with the remainder being Fe, wherein a martensite structure is formed at a surface layer and a fine ferrite structure is formed at a center layer.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: December 1, 2015
    Assignee: Hyundai Steel Company
    Inventors: Sang-Youn Lee, Hyoung-Chul Lee, Yeong-Jun Kwon
  • ULTRA-HIGH-STRENGTH STEEL BAR AND METHOD FOR MANUFACTURING SAME
    Publication number: 20130098513
    Abstract: This invention relates to an ultra-high-strength steel bar and to a method of manufacturing the same, in which the steel bar includes C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with the remainder being Fe, wherein a martensite structure is formed at a surface layer and a fine ferrite structure is formed at a center layer.
    Type: Application
    Filed: April 18, 2011
    Publication date: April 25, 2013
    Applicant: HYUNDAI STEEL COMPANY
    Inventors: Sang-Youn Lee, Hyoung-Chul Lee, Yeong-Jun Kwon