Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9120210 | Open wrench | Tsan-Chang Lee | 2015-09-01 |
| 9114510 | Pawl structure for ratchet wrenches and the wrenches using the same | Tsan-Chang Lee | 2015-08-25 |
| 9016174 | Ratchet wrench | Tsan-Chang Lee | 2015-04-28 |
| D708920 | Pawl of a ratchet wrench | Tsan-Chang Lee | 2014-07-15 |
| 8701524 | Complex wrench | Chiou-Mai Chang | 2014-04-22 |
| 8661946 | Ratchet wrench | Tsan-Chang Lee | 2014-03-04 |
| 8261635 | One-direction rachet wrench | Tsan-Chang Lee | 2012-09-11 |
| 7387052 | Wrench with outstanding grip | Chiou-Mai Chang | 2008-06-17 |