Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9719325 | Downhole tool consistent fluid control | Paul D. Ringgenberg | 2017-08-01 |
| 9428990 | Rotational wellbore test valve | Paul D. Ringgenberg | 2016-08-30 |
| 8973663 | Pump through circulating and or safety circulating valve | Paul D. Ringgenberg | 2015-03-10 |
| 8662180 | Rotational test valve with tension reset | Paul D. Ringgenberg | 2014-03-04 |
| 8607875 | Rotational wellbore test valve | Paul D. Ringgenberg | 2013-12-17 |