Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D424263 | Electric broom | Timmy Hok Yin Sin, Chung Chi Ping | 2000-05-02 |
| D384506 | Electric broom | — | 1997-10-07 |
| 5638572 | Electric broom | — | 1997-06-17 |
| D370322 | Electric broom | — | 1996-05-28 |