Patents by Inventor Jeong Shik Ahn

Jeong Shik 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).

  • Apparatus for automatically measuring a relatively wide range of leakage currents
    Patent number: 7148674
    Abstract: A leakage current measurement apparatus for measuring leakage currents is disclosed. The leakage current measurement apparatus automatically selects one of non-inductive shunt resistors of 10?, 100?, and 1000? and measures leakage currents of an outdoor isolation material for an ultra-high voltage. Additionally, the leakage current measurement apparatus is capable of measuring a relatively wide range of leakage currents with a relatively high precision, even at a remote location, as a measurement range is automatically adjusted within measurement ranges preset by a user when leakage currents of an outdoor isolation material change, and being protected against a surge possibly generated by an ultra-high voltage. Also, it can remotely measure in real-time leakage currents of an outdoor isolation material installed at a remote location over Ethernet.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: December 12, 2006
    Assignee: Korea Electric Power Corporation
    Inventors: In Hyuk Choi, Dong Il Lee, Jeong Shik Ahn, Gil Jo Jung, Jang Hyun Choi