Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655224 | Downward offset barbell type walking beam compositively balance oil pump | Xiangyun Ji, Shengeun Yu, Weidong Zhao, Yuzhen WEI, Wuanjiany Zhang | 2003-12-02 |
| 6450050 | Walking beam balanced span and moment regulating economized oil pump and a stroke regulating device of the same | Changle Gao, Xiangyun Ji, Xuelu Zhang, Shujian Ma | 2002-09-17 |