Issued Patents All Time
Showing 51–66 of 66 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7484559 | Method for drilling and casing a wellbore with a pump down cement float | Jeffery Walter Vert | 2009-02-03 |
| 7475742 | Method for drilling with casing | Robert M. Tessari | 2009-01-13 |
| 7472763 | Wear resistant tubular connection | Maurice William Slack, Robert M. Tessari, Tommy M. Warren | 2009-01-06 |
| 7428927 | Cement float and method for drilling and casing a wellbore with a pump down cement float | Jeffery Walter Vert | 2008-09-30 |
| 7287584 | Anchoring device for a wellbore tool | Maurice William Slack | 2007-10-30 |
| 7237607 | Tubular stabbing protector and method | Gustavo Adrian Lis | 2007-07-03 |
| 7219727 | Wear resistant tubular connection | Maurice William Slack, Robert M. Tessari, Tommy M. Warren | 2007-05-22 |
| 7140455 | Valve method for drilling with casing using pressurized drilling fluid | Bruno Walter, Robert M. Tessari | 2006-11-28 |
| 7090004 | Cement float | Tommy M. Warren | 2006-08-15 |
| 7044241 | Method for drilling with casing | — | 2006-05-16 |
| 7021382 | Downhole axial force generating tool | John E. Hughes | 2006-04-04 |
| 7013992 | Borehole stabilization while drilling | Robert M. Tessari, Tommy M. Warren, Maurice William Slack | 2006-03-21 |
| 6585052 | Casing centralizer | Robert M. Tessari | 2003-07-01 |
| 6513223 | Method for installing a centralizer retaining collar and outer sleeve | Robert M. Tessari | 2003-02-04 |
| 5755289 | Drilling rig elevator with replaceable clamping inserts and method for installation | Jens Lutzhöft, Hans-Jurgen Ulbrich | 1998-05-26 |
| 5433279 | Portable top drive assembly | Robert M. Tessari | 1995-07-18 |