Patents by Inventor Chang Hyeon Ji

Chang Hyeon Ji 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).

  • Leak control valve
    Publication number: 20030037821
    Abstract: A leak control valve preventing the damage of the vacuum pump and/or the neighboring instruments even in the case of fluid leak at the vessel.
    Type: Application
    Filed: August 28, 2002
    Publication date: February 27, 2003
    Inventor: Chang-Hyeon Ji