Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8047032 | Combination lock with two dial plates | Chao-Hsuan Liu, Yu-Chun Liu | 2011-11-01 |
| 7975517 | Multistage lock apparatus | Chao-Hsuan Liu, Yu-Chun Liu | 2011-07-12 |
| 7383708 | Multistage lock cylinder assembly | Chao-Hsuan Liu, Yu-Chun Liu | 2008-06-10 |