Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10703129 | Electric pencil sharpener | Changhai Dai | 2020-07-07 |
| 10556363 | Electric stapler | Changhai Dai | 2020-02-11 |
| 9669651 | Fully-automatic pencil sharpener | Liangchun Zhong, Changhai Dai | 2017-06-06 |