Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8388148 | Optical system including a blocking unit | Kee-uk Jeon, Sang-Ik Kim, Kyoung-choul Jang, Wook Jeon | 2013-03-05 |
| 8289637 | Focus adjustment device for use in portable image projection apparatus | Jun Seok Park, Sang-Ik Kim | 2012-10-16 |