Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10527034 | Digitized automatic control method for oil-pumping and digitized balance-shifting pumpjack | Shenghong Zheng, Shujian Ma, Ninghui Li, Shengcun Yu, Kangjun Wang +6 more | 2020-01-07 |
| 6450050 | Walking beam balanced span and moment regulating economized oil pump and a stroke regulating device of the same | Renquan Luo, Xiangyun Ji, Xuelu Zhang, Shujian Ma | 2002-09-17 |