Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9556644 | Apparatus for opening and closing entrance | Eunsook Lee, Chaeho Yoon | 2017-01-31 |
| 9556645 | Apparatus for opening and closing front entrance | Eunsook Lee, Chaehi Yoon | 2017-01-31 |
| 9528299 | Digital entrance opening and closing device | Eunsook Lee, Chaehi Yoon | 2016-12-27 |