Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10392872 | Pressure control device for use with a subterranean well | Lev Ring | 2019-08-27 |
| 10267117 | Radial seal pressure reduction using internal pump | Thomas F. Bailey, Don M. Hannegan, Lev Ring | 2019-04-23 |