Patents by Inventor Young-Cheul AHN

Young-Cheul AHN 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 PIPE FOR LINE PIPE WITH EXCELLENT LOW TEMPERATURE TOUGHNESS OF WELDED ZONE AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20260166613
    Abstract: Disclosed are a steel pipe for a line pipe having excellent low temperature toughness in a welded zone thereof, and a method for manufacturing the same, in which alloy components and a ratio thereof are controlled, and high frequency heat-treatment is carried out on the welded zone, and immediately thereafter, a cooling process is performed thereon in a strictly controlled manner, thereby improving the low temperature toughness of the welded zone, such that a resulting steel pipe is suitable for use in a pipeline and an offshore structure.
    Type: Application
    Filed: February 5, 2026
    Publication date: June 18, 2026
    Inventors: Yi-Yong KIM, Kwang-Jin CHOI, Dong-Jik KUM, Chang-Ki AN, Si-Yun CHOI, Young-Cheul AHN, Jae-Yeon CHO
  • Steel pipe for line pipe with excellent low temperature toughness of welded zone and method for manufacturing the same
    Patent number: 12611704
    Abstract: Disclosed are a steel pipe for a line pipe having excellent low temperature toughness in a welded zone thereof, and a method for manufacturing the same, in which alloy components and a ratio thereof are controlled, and high frequency heat-treatment is carried out on the welded zone, and immediately thereafter, a cooling process is performed thereon in a strictly controlled manner, thereby improving the low temperature toughness of the welded zone, such that a resulting steel pipe is suitable for use in a pipeline and an offshore structure.
    Type: Grant
    Filed: July 13, 2023
    Date of Patent: April 28, 2026
    Assignee: NEXTEEL CO., LTD.
    Inventors: Yi-Yong Kim, Kwang-Jin Choi, Dong-Jik Kum, Chang-Ki An, Si-Yun Choi, Young-Cheul Ahn, Jae-Yeon Cho
  • STEEL PIPE FOR LINE PIPE WITH EXCELLENT LOW TEMPERATURE TOUGHNESS OF WELDED ZONE AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20240390967
    Abstract: Disclosed are a steel pipe for a line pipe having excellent low temperature toughness in a welded zone thereof, and a method for manufacturing the same, in which alloy components and a ratio thereof are controlled, and high frequency heat-treatment is carried out on the welded zone, and immediately thereafter, a cooling process is performed thereon in a strictly controlled manner, thereby improving the low temperature toughness of the welded zone, such that a resulting steel pipe is suitable for use in a pipeline and an offshore structure.
    Type: Application
    Filed: July 13, 2023
    Publication date: November 28, 2024
    Inventors: Yi-Yong KIM, Kwang-Jin CHOI, Dong-Jik KUM, Chang-Ki AN, Si-Yun CHOI, Young-Cheul AHN, Jae-Yeon CHO