Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9828979 | Accumulator over hydraulic pump double-acting cylinder for artificial lift operations | Tao Tao, Huajun Chen, Yanmei Li | 2017-11-28 |
| 9631463 | Accumulator counterbalanced three chamber cylinder for artificial lift operations | Tao Tao, Huajun Chen, Yanmei Li | 2017-04-25 |
| 9631464 | Pneumatic-on-top counterbalanced three-chamber cylinder for artificial lift operations | Tao Tao, Huajun Chen, Yanmei Li | 2017-04-25 |