Patents by Inventor Do Hak Kim

Do Hak Kim 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 material for taylor welded blank and method for manufacturing hot-stamped part using same steel
    Patent number: 11655518
    Abstract: In accordance with one aspect of the present disclosure, there is provided a steel material for a tailor-welded blank, including 0.04 to 0.06 wt % of carbon (C), 1.2 to 1.5 wt % of manganese (Mn), 0.01 to 0.10 wt % of titanium (Ti), 0.01 to 0.10 wt % of niobium (Nb), and the balance of iron (Fe) and inevitable impurities; having a tensile strength (TS) of 550 MPa or greater, a yield strength (YS) of 300 MPa or greater, and an elongation (EL) of 20% or greater; and having a dual-phase structure of ferrite and martensite.
    Type: Grant
    Filed: November 16, 2021
    Date of Patent: May 23, 2023
    Assignee: Hyundai Steel Company
    Inventors: Byung Gil Yoo, Hyeong Hyeop Do, Chee Woong Song, Do Hak Kim, Young Mun Shin, Soon Geun Jang, Sang Mun Hong
  • Steel material for taylor welded blank and method for manufacturing hot-stamped part using same steel
    Patent number: 11629389
    Abstract: In accordance with one aspect of the present disclosure, there is provided a steel material for a tailor-welded blank, including 0.04 to 0.06 wt % of carbon (C), 1.2 to 1.5 wt % of manganese (Mn), 0.01 to 0.10 wt % of titanium (Ti), 0.01 to 0.10 wt % of niobium (Nb), and the balance of iron (Fe) and inevitable impurities; having a tensile strength (TS) of 550 MPa or greater, a yield strength (YS) of 300 MPa or greater, and an elongation (EL) of 20% or greater; and having a dual-phase structure of ferrite and martensite.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: April 18, 2023
    Assignee: Hyundai Steel Company
    Inventors: Byung Gil Yoo, Hyeong Hyeop Do, Chee Woong Song, Do Hak Kim, Young Mun Shin, Soon Geun Jang, Sang Mun Hong
  • STEEL MATERIAL FOR TAYLOR WELDED BLANK AND METHOD FOR MANUFACTURING HOT-STAMPED PART USING SAME STEEL
    Publication number: 20220074017
    Abstract: In accordance with one aspect of the present disclosure, there is provided a steel material for a tailor-welded blank, including 0.04 to 0.06 wt % of carbon (C), 1.2 to 1.5 wt % of manganese (Mn), 0.01 to 0.10 wt % of titanium (Ti), 0.01 to 0.10 wt % of niobium (Nb), and the balance of iron (Fe) and inevitable impurities; having a tensile strength (TS) of 550 MPa or greater, a yield strength (YS) of 300 MPa or greater, and an elongation (EL) of 20% or greater; and having a dual-phase structure of ferrite and martensite.
    Type: Application
    Filed: November 16, 2021
    Publication date: March 10, 2022
    Inventors: Byung Gil Yoo, Hyeong Hyeop Do, Chee Woong Song, Do Hak Kim, Young Mun Shin, Soon Geun Jang, Sang Mun Hong
  • STEEL MATERIAL FOR TAYLOR WELDED BLANK AND METHOD FOR MANUFACTURING HOT-STAMPED PART USING SAME STEEL
    Publication number: 20210292866
    Abstract: In accordance with one aspect of the present disclosure, there is provided a steel material for a tailor-welded blank, including 0.04 to 0.06 wt % of carbon (C), 1.2 to 1.5 wt % of manganese (Mn), 0.01 to 0.10 wt % of titanium (Ti), 0.01 to 0.10 wt % of niobium (Nb), and the balance of iron (Fe) and inevitable impurities; having a tensile strength (TS) of 550 MPa or greater, a yield strength (YS) of 300 MPa or greater, and an elongation (EL) of 20% or greater; and having a dual-phase structure of ferrite and martensite.
    Type: Application
    Filed: December 29, 2017
    Publication date: September 23, 2021
    Inventors: Byung Gil Yoo, Hyeong Hyeop Do, Chee Woong Song, Do Hak Kim, Young Mun Shin, Soon Geun Jang, Sang Mun Hong