Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7654539 | Locking drill chuck | Yanzhao Li | 2010-02-02 |
| 7296803 | Chuck | Xingda Tan | 2007-11-20 |
| 7249770 | Locking drill chuck | Mingquan Cai | 2007-07-31 |
| 7128324 | Hammerlock chuck | Xingda Tan | 2006-10-31 |
| 6991238 | Locking drill chuck | Yanzhao Li | 2006-01-31 |
| 6848691 | Hammerlock chuck | Xingda Tan | 2005-02-01 |
| 6247705 | Manual tightened chuck | Shengzhi Yang, Mingquan Cai, Lianhai Long, Kangiun Sun | 2001-06-19 |