Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10280720 | Submersible reciprocating oil well pump unit | Ruiqi Zhang | 2019-05-07 |
| 7780428 | Fluid-guiding and electric conducting system for suspended electric submersible progressing cavity pump (PCP) | Ruiqi Zhang | 2010-08-24 |