Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8881835 | Manipulator tool and tool catcher useful with wellbore reverse circulation | Barry J. Tate, Tommy M. Warren | 2014-11-11 |
| 8443906 | Tools and methods useful with wellbore reverse circulation | Barry J. Tate, Tommy M. Warren | 2013-05-21 |
| 7647990 | Method for drilling with a wellbore liner | Tommy M. Warren, Barry J. Tate | 2010-01-19 |
| 7637330 | Casing bottom hole assembly retrieval process | Per Angman, Tommy M. Warren | 2009-12-29 |
| 7624820 | Method for drilling with casing | Per Angman | 2009-12-01 |
| 7475742 | Method for drilling with casing | Per Angman | 2009-01-13 |
| 7472763 | Wear resistant tubular connection | Maurice William Slack, Per Angman, Tommy M. Warren | 2009-01-06 |
| 7219727 | Wear resistant tubular connection | Maurice William Slack, Per Angman, Tommy M. Warren | 2007-05-22 |
| 7140455 | Valve method for drilling with casing using pressurized drilling fluid | Bruno Walter, Per Angman | 2006-11-28 |
| 7108080 | Method and apparatus for drilling a borehole with a borehole liner | Bruce D. Houtchens | 2006-09-19 |
| 7013992 | Borehole stabilization while drilling | Tommy M. Warren, Per Angman, Maurice William Slack | 2006-03-21 |
| 6705413 | Drilling with casing | — | 2004-03-16 |
| 6585052 | Casing centralizer | Per Angman | 2003-07-01 |
| 6513223 | Method for installing a centralizer retaining collar and outer sleeve | Per Angman | 2003-02-04 |
| 5433279 | Portable top drive assembly | Per Angman | 1995-07-18 |