Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11608707 | Removable core wiper plug | Gunnar Lende | 2023-03-21 |
| 11448038 | Reverse cementing valve system and method employing a double flapper valve with sliding sleeve and drillable nose | Jinhua Cao, Michael Linley Fripp, Lonnie Carl Helms | 2022-09-20 |
| 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 |
| 11293253 | Dual sub-surface release plug with bypass for small diameter liners | Handoko Tirto Santoso, Lonnie Carl Helms, Frank Vinicia Acosta, Thomas Zachary Vonk, Rajesh Parameshwaraiah | 2022-04-05 |
| 11193348 | Section milled window cementing diverter | Gunnar Lende | 2021-12-07 |
| 11066900 | Removable core wiper plug | Gunnar Lende | 2021-07-20 |