Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9599251 | Check valve driving device for injecting gas | Dae Jin Lee, Sung-Hyeok Kim, Kwang-Cheol Heo, Jong-Suk Kim | 2017-03-21 |
| 9482362 | Check valve for injecting gas | Dae Jin Lee, Sung-Hyeok Kim, Kwang-Cheol Heo, Jong-Suk Kim | 2016-11-01 |