Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9085951 | Subsea connection apparatus for a surface blowout preventer stack | Johnnie E. Kotrla | 2015-07-21 |
| 8695691 | Subsea connection apparatus for a surface blowout preventer stack | Johnnie E. Kotrla | 2014-04-15 |
| 8136598 | Subsea connection apparatus for a surface blowout preventer stack | Johnnie E. Kotrla | 2012-03-20 |
| 7779917 | Subsea connection apparatus for a surface blowout preventer stack | Johnnie E. Kotrla | 2010-08-24 |