Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9822614 | Combined casing system and method | William Robert Portas, Djurre Hans Zijsling | 2017-11-21 |
| 7823659 | Apparatus and methods for drilling and lining a wellbore | Kevin Waddell, Edwin Zwald, Charles Butterfield, Mark Holland, Akindele Olufowoshe +2 more | 2010-11-02 |
| 6581980 | Threaded connection with high compressive rating | Richard W. DeLange, Merle E. Evans, Reji Eason | 2003-06-24 |