Issued Patents 2022
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11313189 | Downhole check valve assembly with a frustoconical mandrel | Lonnie Carl Helms, Stephen Yeldell, Min Mark Yuan | 2022-04-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11313189 | Downhole check valve assembly with a frustoconical mandrel | Lonnie Carl Helms, Stephen Yeldell, Min Mark Yuan | 2022-04-26 |