Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10156233 | Dual control valve for reciprocating compressor unloader system | Tingrong Ren, Keith E. Stephens | 2018-12-18 |
| 9835147 | Dual control valve for reciprocating compressor unloader system | Tingrong Ren, Keith E. Stephens | 2017-12-05 |