Patents by Inventor Do-Kyeong HAN

Do-Kyeong HAN 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).

  • ZINC ALLOY-PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND SURFACE QUALITY, AND METHOD FOR PRODUCING SAME
    Publication number: 20250146115
    Abstract: Provided is a zinc alloy-plated steel material having excellent corrosion resistance and surface qualities. The steel material includes: a base steel; a zinc alloy-plating layer formed on the base steel, wherein the zinc alloy-plating layer comprises, by weight %, 8 to 25% of aluminum (Al), 4 to 12% of magnesium (Mg), and a balance of zinc (Zn) and inevitable impurities; and a polygonal solidification phase formed in a surface of the zinc alloy-plating layer and having a substantially straight boundary line between the polygonal solidification phase and a microstructure surrounding the polygonal solidification phase. The substantially straight boundary line forms an angle with an adjacent substantially straight boundary line, and an area fraction occupied by the polygonal solidification phase on the surface of the zinc alloy-plating layer is 20 to 90%.
    Type: Application
    Filed: January 10, 2025
    Publication date: May 8, 2025
    Inventors: Heung-Yun KIM, Do-Kyeong HAN, Myung-Soo KIM
  • CARBON FILAMENT WIRE FOR LASER WELDING OF STEEL SHEET HAVING ALUMINIUM-BASED COATING LAYER, LASER WELDING METHOD OF STEEL SHEET HAVING ALUMINIUM-BASED COATING LAYER USING SAME, AND WELDED PRODUCT PRODUCED BY SAME
    Publication number: 20240024979
    Abstract: One embodiment of the present invention provides a carbon filament wire for laser welding of a steel sheet having an aluminum-based coating layer, a laser welding method of a steel sheet having an aluminum-based coating layer by using same, and a welded product produced by same, the carbon filament wire comprising: a resin matrix; and two or more carbon filaments provided inside the resin matrix.
    Type: Application
    Filed: June 28, 2022
    Publication date: January 25, 2024
    Applicant: POSCO Co., Ltd
    Inventors: Mok-Young Lee, Du-Youl Choi, Sang-Ho Uhm, Do-Kyeong Han
  • Galvanized steel sheet having excellent plating adhesion and corrosion resistance
    Patent number: 11618939
    Abstract: Provided is a galvanized steel sheet having excellent plating adhesion, having a plated layer with improved friction characteristics by means of a predetermined level of Fe elution, and having excellent corrosion resistance; and a manufacturing method therefor.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: April 4, 2023
    Assignee: POSCO CO., LTD
    Inventors: Do-Kyeong Han, Heung-Yun Kim
  • GALVANIZED STEEL SHEET HAVING EXCELLENT PLATING ADHESION AND CORROSION RESISTANCE, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20220010420
    Abstract: Provided is a galvanized steel sheet having excellent plating adhesion, having a plated layer with improved friction characteristics by means of a predetermined level of Fe elution, and having excellent corrosion resistance; and a manufacturing method therefor.
    Type: Application
    Filed: November 27, 2019
    Publication date: January 13, 2022
    Inventors: Do-Kyeong HAN, Heung-Yun KIM
  • ZINC ALLOY-PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND SURFACE QUALITY, AND METHOD FOR PRODUCING SAME
    Publication number: 20210381091
    Abstract: Provided is a zinc alloy-plated steel material used in automobiles, building materials, home appliances, or the like, and more specifically, to a zinc alloy-plated steel material having excellent corrosion resistance and surface quality, and a method for producing same.
    Type: Application
    Filed: December 12, 2019
    Publication date: December 9, 2021
    Inventors: Heung-Yun KIM, Do-Kyeong HAN, Myung-Soo KIM