Patents by Inventor Sang Muk Na

Sang Muk Na 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).

  • Patent number: 8281476
    Abstract: Disclosed is a method of manufacturing a multilayered tube, including: preparing an outer tube, an inner tube having an outer diameter of 95˜98% of an inner diameter of the outer tube, and dies with a shaping void having a diameter of 100.20˜100.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: October 9, 2012
    Assignee: Hyundai Hysco
    Inventors: Ju Haeng Hur, Dong Hyun Jeon, Yun Gyu Kim, Hyo Sub Kim, Sang Muk Na
  • Patent number: 8257516
    Abstract: The present invention relates to a method of manufacturing ultra-high strength steel products and, more particularly, to a method of manufacturing ultra-high strength steel products suitable for production of articles having a complicated shape or a high processing depth. The method includes preparing a steel sheet by blanking the steel sheet having hardenability to form a rough shape of a final product, cold-pressing the steel sheet to form a 50˜80% shape of the final product, precisely trimming the cold-formed steel sheet along a contour line corresponding to an outer contour of the final product, and hot-pressing the trimmed product to form the remaining 20˜50% shape of the final product and quenching simultaneous with hot-pressing, after heating the trimmed product to an austenite region of 700° C. or more.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: September 4, 2012
    Assignee: Hyundai Hysco
    Inventors: Hee Joong Im, Seung Man Nam, Man Been Moon, Sang Muk Na, Sung Namkoong
  • Publication number: 20110120585
    Abstract: Disclosed is a method of manufacturing a multilayered tube, including: preparing an outer tube, an inner tube having an outer diameter of 95˜98% of an inner diameter of the outer tube, and dies with a shaping void having a diameter of 100.20˜100.
    Type: Application
    Filed: January 28, 2009
    Publication date: May 26, 2011
    Applicant: Hyundai Hysco
    Inventors: Ju Haeng Hur, Dong Hyun Jeon, Yun Gyu Kim, Hyo Sub Kim, Sang Muk Na
  • Publication number: 20100269962
    Abstract: The present invention relates to a method of manufacturing ultra-high strength steel products and, more particularly, to a method of manufacturing ultra-high strength steel products suitable for production of articles having a complicated shape or a high processing depth. The method includes preparing a steel sheet by blanking the steel sheet having hardenability to form a rough shape of a final product, cold-pressing the steel sheet to form a 50˜80% shape of the final product, precisely trimming the cold-formed steel sheet along a contour line corresponding to an outer contour of the final product, and hot-pressing the trimmed product to form the remaining 20˜50% shape of the final product and quenching simultaneous with hot-pressing, after heating the trimmed product to an austenite region of 700° C. or more.
    Type: Application
    Filed: May 27, 2009
    Publication date: October 28, 2010
    Applicant: Hyundai Hysco
    Inventors: Hee Joong Im, Seung Man Nam, Man Been Moon, Sang Muk Na, Sung Namkoong