Patents by Inventor Hyeong Chang RYU

Hyeong Chang RYU 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: 12226845
    Abstract: An apparatus and method for cleaning an oxide film using a direct current reverse polarity are provided. The apparatus for cleaning an oxide film formed on a workpiece may include a power supply configured to apply direct current power and to include a positive electrode terminal and a negative electrode terminal, the workpiece configured to be electrically connected to the negative electrode terminal to act as a negative electrode to which a current is applied, and a torch having a positive electrode, which is spaced apart from the oxide film by a predetermined distance and is electrically connected to the positive electrode terminal, the torch being installed to be movable relative to the workpiece. The oxide film formed on the workpiece may be removed by applying a reverse polarity direct current between the workpiece, serving as the negative electrode, and the positive electrode to generate an arc.
    Type: Grant
    Filed: August 24, 2020
    Date of Patent: February 18, 2025
    Assignees: DOOSAN ENERBILITY CO., LTD., PUKYONG NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION
    Inventors: Yoon Sang Lee, Hyun Sang Kong, Jae Yun Shin, Sang Myung Cho, Hyo Jin Baek, Chang Ik Lee, Hyeong Chang Ryu, Kyeong Seob Lim
  • Publication number: 20210078095
    Abstract: An apparatus and method for cleaning an oxide film using a direct current reverse polarity are provided. The apparatus for cleaning an oxide film formed on a workpiece may include a power supply configured to apply direct current power and to include a positive electrode terminal and a negative electrode terminal, the workpiece configured to be electrically connected to the negative electrode terminal to act as a negative electrode to which a current is applied, and a torch having a positive electrode, which is spaced apart from the oxide film by a predetermined distance and is electrically connected to the positive electrode terminal, the torch being installed to be movable relative to the workpiece. The oxide film formed on the workpiece may be removed by applying a reverse polarity direct current between the workpiece, serving as the negative electrode, and the positive electrode to generate an arc.
    Type: Application
    Filed: August 24, 2020
    Publication date: March 18, 2021
    Inventors: Yoon Sang LEE, Hyun Sang KONG, Jae Yun SHIN, Sang Myung CHO, Hyo Jin BAEK, Chang Ik LEE, Hyeong Chang RYU, Kyeong Seob LIM