Patents by Inventor Jay Hyung Jung

Jay Hyung Jung 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).

  • Steel wire rod for high strength and high toughness spring having excellent cold workability, method for producing the same and method for producing spring by using the same
    Patent number: 8734599
    Abstract: Provided is a steel wire rod for a high strength and high toughness spring having excellent cold workability, the steel wire rod having a composition comprising: in weight %, C: 0.4 to 0.7%, Si: 1.5 to 3.5%, Mn: 0.3 to 1.0%, Cr: 0.01 to 1.5%, Ni: 0.01 to 1.0%, Cu: 0.01 to 1.0%, B: 0.005 to 0.02%, Al: 0.1% or less, O: 0.0020% or less, P: 0.02% or less, S: 0.02% or less, N: 0.02% or less, remainder Fe, and other unavoidable impurities, having a microstructure formed of ferrite and pearlite, and in which a prior (before cooling) austenite grain size is 8 ?m or less.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: May 27, 2014
    Assignee: Posco
    Inventors: Sang Woo Choi, Hoe Young Jung, Yong Tae Shin, Duk Lak Lee, Jeong Do Seo, Jay Hyung Jung, Byoung Ju Park, Jae Seung Lee
  • Steel Wire Rod for High Strength and High Toughness Spring Having Excellent Cold Workability, Method for Producing the Same and Method for Producing Spring by Using the Same
    Publication number: 20100175795
    Abstract: Provided is a steel wire rod for a high strength and high toughness spring having excellent cold workability, the steel wire rod having a composition comprising: in weight %, C: 0.4 to 0.7%, Si: 1.5 to 3.5%, Mn: 0.3 to 1.0%, Cr: 0.01 to 1.5%, Ni: 0.01 to 1.0%, Cu: 0.01 to 1.0%, B: 0.005 to 0.02%, Al: 0.1% or less, O: 0.0020% or less, P: 0.02% or less, S: 0.02% or less, N: 0.02% or less, remainder Fe, and other unavoidable impurities, having a microstructure formed of ferrite and pearlite, and in which a prior (before cooling) austenite grain size is 8 ?m or less.
    Type: Application
    Filed: October 10, 2007
    Publication date: July 15, 2010
    Applicant: POSCO
    Inventors: Sang Woo Choi, Hoe Young Jung, Yong Tae Shin, Duk Lak Lee, Jeong Do Seo, Jay Hyung Jung, Byoung Ju Park, Jae Seung Lee