Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6739711 | Ink cartridge | Young Su Lee, Jeong-seon Kim, O-hyun Baek, Jae-cheol Lee, Moo-youl Kim +1 more | 2004-05-25 |
| 6623092 | Ink cartridge with separate magnets | Jeong-seon Kim, Oh-hyun Baek, Jae-cheol Lee, Sik Choi, Young Su Lee +1 more | 2003-09-23 |