Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11109667 | Device of bi-spiral cleaning brush | Chih-An Ku, Hung-Chieh Chao, Fu-Qiang Zhang | 2021-09-07 |
| 10758946 | Device of cleaning brush | Chih-An Ku, Hung-Chieh Chao | 2020-09-01 |