Patents by Inventor Jun-Ku Hahn

Jun-Ku Hahn 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).

  • Electrical device having PTC conductive polymer
    Patent number: 6965293
    Abstract: An electrical device including a PTC conductive polymer sheet, and first and second electrodes physically contacted with opposite surfaces of the conductive polymer sheet is disclosed. The first and second electrodes have a plurality of protrusions protruded from surfaces thereof, respectively. The protrusions have an surface roughness (Rz) of 1 to 20 ?m and an average width ({overscore (Rw)}) which is 0.5 to 2 times of the surface roughness (Rz), and an average gap ({overscore (Rg)}) between adjacent protrusions is 0.5 and 2 times of the surface roughness (Rz). The conductive polymer sheet has a thickness which is more than 5 times of the surface roughness (Rz).
    Type: Grant
    Filed: June 24, 2004
    Date of Patent: November 15, 2005
    Assignee: LG Cable, Ltd.
    Inventors: Soo-An Choi, Jong-Ho Lee, Chang-Hee Choi, Tae-Sung Kim, Jun-Ku Hahn