Issued Patents 2022
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11519258 | Pressure testing casing string during reverse cementing operations | Lonnie Carl Helms | 2022-12-06 |
| 11448038 | Reverse cementing valve system and method employing a double flapper valve with sliding sleeve and drillable nose | Michael Linley Fripp, Tor Sigve Saetre, Lonnie Carl Helms | 2022-09-20 |
| 11274519 | Reverse cementing tool | Lonnie Carl Helms, Handoko Tirto Santoso | 2022-03-15 |