Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8857010 | Vacuum cleaner having shredder | Jang-keun Kim, Kang-Doo Kim, Chang Hyun Park, Yong-jae Yong, Sung-cheol Lee +2 more | 2014-10-14 |
| 8522395 | Vacuum cleaner having shredder | Jang-keun Oh, Jun Hwa Lee, Sung-cheol Lee, Chang Hyun Park, Jun Hoo Choe +2 more | 2013-09-03 |