Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6788271 | Helical antenna manufacturing apparatus and method thereof | Dong-Seok Chang, Hyung Jong Kim | 2004-09-07 |
| 6285340 | Helical antenna for portable phones and manufacturing method thereof | Duck Jae Park, Jong Cheol YUN, Kyu-Bok Lee, Jae Suk Sung | 2001-09-04 |
| 6023251 | Ceramic chip antenna | Dong-Seok Chang, Jae Suk Sung, Woo Sung Lee | 2000-02-08 |