Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8113485 | Leak-proof structure of oil pipe connector | Ying-Ying Chang, Li-Jen Chang | 2012-02-14 |
| 8082942 | Oil pipe connector | Ying-Ying Chang, Li-Jen Chang | 2011-12-27 |
| 7542819 | Method and system for managing product output | Yi-Ming Liao, Pei-Huan Chung, Cheng-Ju Chen, Wen-Yi Chang | 2009-06-02 |