Issued Patents 2022
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11512545 | Downhole check valve assembly with a ratchet mechanism | Min Mark Yuan, Stephen Yeldell, Lonnie Carl Helms, Frank Acosta | 2022-11-29 |
| 11473395 | Downhole check valve assembly with a locking mechanism | Stephen Yeldell, Lonnie Carl Helms, Min Mark Yuan, Frank Acosta | 2022-10-18 |
| 11391119 | Differential fill valve with collet sleeve | Rajesh Parameshwaraiah, Min Mark Yuan, Saul Emmanuel Vazquez Niebla, Lonnie Carl Helms, Mayur Narain Ahuja +1 more | 2022-07-19 |
| 11293260 | Buoyancy assist tool | Avinash Gopal Dharne, Stephen Yeldell, Frank Acosta, Min Mark Yuan | 2022-04-05 |
| 11293261 | Buoyancy assist tool | Min Mark Yuan, Stephen Yeldell, Lonnie Carl Helms, Frank Acosta, Rajesh Parameshwaraiah | 2022-04-05 |