Issued Patents All Time
Showing 25 most recent of 55 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8881835 | Manipulator tool and tool catcher useful with wellbore reverse circulation | Robert M. Tessari, Barry J. Tate | 2014-11-11 |
| 8443906 | Tools and methods useful with wellbore reverse circulation | Robert M. Tessari, Barry J. Tate | 2013-05-21 |
| 8230947 | Method of selecting a drilling motor for a casing drill string | — | 2012-07-31 |
| 8176986 | Method of circulating while retrieving bottom hole assembly in casing | Preston T. Honeycutt, Michael Brouse | 2012-05-15 |
| 7886847 | Monitoring flow rates while retrieving bottom hole assembly during casing while drilling operations | Erik P. Eriksen, Michael E. Moffitt | 2011-02-15 |
| 7845417 | Method of circulating while retrieving downhole tool in casing | Preston T. Honeycutt, Michael Brouse | 2010-12-07 |
| 7845431 | Retrieval tool with slips for retrieving bottom hole assembly during casing while drilling operations | Erik P. Eriksen, Michael E. Moffitt | 2010-12-07 |
| 7814972 | Wireline entry sub | Per Angman | 2010-10-19 |
| 7798251 | Circulation system for retrieval of bottom hole assembly during casing while drilling operations | Erik P. Eriksen, Michael E. Moffitt | 2010-09-21 |
| 7779920 | Controlling backflow pressure during retrieval of bottom hole assembly | Erik P. Eriksen, Michael E. Moffitt | 2010-08-24 |
| 7775302 | Casing shoe and retrievable bit assembly | — | 2010-08-17 |
| 7708077 | Retrieval of bottom hole assembly during casing while drilling operations | Erik P. Eriksen, Michael E. Moffitt | 2010-05-04 |
| 7647990 | Method for drilling with a wellbore liner | Robert M. Tessari, Barry J. Tate | 2010-01-19 |
| 7637330 | Casing bottom hole assembly retrieval process | Per Angman, Robert M. Tessari | 2009-12-29 |
| 7604057 | Incremental U-tube process to retrieve of bottom hole assembly during casing while drilling operations | Erik P. Eriksen, Michael E. Moffitt | 2009-10-20 |
| 7575061 | Wireline entry sub and method of using | Per Angman | 2009-08-18 |
| 7520343 | Retrievable center bit | John E. Hughes | 2009-04-21 |
| 7472763 | Wear resistant tubular connection | Maurice William Slack, Robert M. Tessari, Per Angman | 2009-01-06 |
| 7219727 | Wear resistant tubular connection | Maurice William Slack, Robert M. Tessari, Per Angman | 2007-05-22 |
| 7090004 | Cement float | Per Angman | 2006-08-15 |
| 7013992 | Borehole stabilization while drilling | Robert M. Tessari, Per Angman, Maurice William Slack | 2006-03-21 |
| 5941323 | Steerable directional drilling tool | — | 1999-08-24 |
| 5802011 | Pressure signalling for fluidic media | Warren J. Winters | 1998-09-01 |
| 5601151 | Drilling tool | — | 1997-02-11 |
| 5547031 | Orientation control mechanism | Houston B. Mount, II | 1996-08-20 |