Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7004131 | Engine shaft pump | Liyun Zheng | 2006-02-28 |
| 6920850 | Engine lubrication system | Liyun Zheng | 2005-07-26 |
| 6860250 | Engine lubrication system and pressure reducing valve for limiting overhead oil flow | Liyun Zheng | 2005-03-01 |
| 6810845 | Lubrication system using valves to meet various engine oil pressure requirements | Liyun Zheng | 2004-11-02 |