Patents by Inventor JIN YU CHOI

JIN YU CHOI 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).

  • Friction apparatus
    Patent number: 10662588
    Abstract: A friction apparatus is provided. The friction apparatus includes: a first member having a first surface; and a second member having a second surface that contacts the first surface, and moving while in contact with the first member, wherein at least one of the first surface and the second surface is hardened.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: May 26, 2020
    Assignee: KOREA RAILROAD RESEARCH INSTITUTE
    Inventors: Yong Hyeon Cho, Jin Yu Choi, Yun Suk Kang, Joo Uk Kim
  • FRICTION APPARATUS
    Publication number: 20180148897
    Abstract: A friction apparatus is provided. The friction apparatus includes: a first member having a first surface; and a second member having a second surface that contacts the first surface, and moving while in contact with the first member, wherein at least one of the first surface and the second surface is hardened.
    Type: Application
    Filed: May 19, 2016
    Publication date: May 31, 2018
    Inventors: YONG HYEON CHO, JIN YU CHOI, YUN SUK KANG, JOO UK KIM