Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6676884 | Dual-structure helmet and method of manufacturing the same | Myung-Ho Jung, Dae Ki Park, Seung Han Park | 2004-01-13 |
| 6598238 | Jaw protecting apparatus of helmet | Kwang-Moon Choi, Jin-gon Lee, Jung Hwan Park | 2003-07-29 |
| 6468644 | Dual-structure helmet and method of manufacturing the same | Myung-Ho Jung, Dae Ki Park, Seung Han Park | 2002-10-22 |
| 6120208 | Prefabrication type high level road structure and construction method thereof | — | 2000-09-19 |