Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8661607 | Visualization device for dust collection of vacuum cleaner | Geunbae Hwang | 2014-03-04 |
| 8549700 | Visualization device for dust collection of vacuum cleaner | Geunbae Hwang | 2013-10-08 |