Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7798022 | Testing devices for multihole workpiece | Lei Li, Ping Chen, Zhi Cheng, Lin Dong, Chang-Fa Sun | 2010-09-21 |
| 7428783 | Testing system for flatness and parallelism | Lei Li, Zhi Cheng, Ping Chen, Xue-Liang Zhai, Chang-Fa Sun | 2008-09-30 |