Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8141883 | Self-locking mechanism of manually tightened drill chuck | Luwen Zhang, Youfeng Zhang | 2012-03-27 |
| D565376 | Drill chuck | — | 2008-04-01 |
| D565377 | Drill chuck | — | 2008-04-01 |
| D563188 | Drill chuck | — | 2008-03-04 |
| D563187 | Drill chuck | — | 2008-03-04 |
| D562099 | Drill chuck | — | 2008-02-19 |
| D555181 | Drill chuck | — | 2007-11-13 |