Issued Patents All Time
Showing 26–50 of 75 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8651202 | Percussion drilling assembly having a floating feed tube | Shantanu N. Swadi, Lance D. Underwood, Jack Marshall, Kevin Edgar Harrington | 2014-02-18 |
| 8640792 | Flexible directional drilling apparatus and related methods | Lance D. Underwood | 2014-02-04 |
| 8459357 | Milling system and method of milling | Praful C. Desai | 2013-06-11 |
| 8387725 | Percussion drilling assembly and hammer bit with gage and outer row reinforcement | Shantanu N. Swadi, Angelo Spedale, Alan J. Marshall | 2013-03-05 |
| 8186458 | Expandable window milling bit and methods of milling a window in casing | Praful C. Desai, John E. Campbell | 2012-05-29 |
| 8122977 | Cutting device with multiple cutting structures | Praful C. Desai | 2012-02-28 |
| 7950475 | Percussion drilling assembly having a floating feed tube | Shantanu N. Swadi, Lance D. Underwood, Jack Marshall, Kevin Edgar Harrington | 2011-05-31 |
| 7861802 | Flexible directional drilling apparatus and method | Lance D. Underwood | 2011-01-04 |
| 7757787 | Drilling and hole enlargement device | Alexander Craig Mackay, George A. Espiritu | 2010-07-20 |
| 7753139 | Cutting device with multiple cutting structures | Praful C. Desai | 2010-07-13 |
| 7597158 | Drilling and hole enlargement device | John E. Campbell, Lance D. Underwood, Ronald G. Schmidt | 2009-10-06 |
| 7513318 | Steerable underreamer/stabilizer assembly and method | Lance D. Underwood | 2009-04-07 |
| 7506703 | Drilling and hole enlargement device | John E. Campbell, Lance D. Underwood, Ronald G. Schmidt | 2009-03-24 |
| 7448446 | Thru tubing tool and method | John E. Campbell, Chad D. Evans | 2008-11-11 |
| 7377328 | Expandable anchor | Brian Cruickshank, John E. Campbell | 2008-05-27 |
| 7373988 | Liner running system and method | John E. Campbell, Brian Cruickshank | 2008-05-20 |
| 7314099 | Selectively actuatable expandable underreamer/stablizer | Wei Xu | 2008-01-01 |
| 7225889 | Downhole motor locking assembly and method | — | 2007-06-05 |
| 7207401 | One trip milling system | Praful C. Desai | 2007-04-24 |
| 7178589 | Thru tubing tool and method | John E. Campbell, Chad D. Evans | 2007-02-20 |
| 7152698 | Downhole motor locking assembly and method | — | 2006-12-26 |
| 7077204 | Whip retrieval method and apparatus | Brian Cruickshank, Wei Xu | 2006-07-18 |
| 7048078 | Expandable underreamer/stabilizer | Wei Xu | 2006-05-23 |
| 6935431 | Well reference apparatus and method | John E. Campbell, Wei Xu | 2005-08-30 |
| 6899183 | Casing attachment method and apparatus | John E. Campbell, Wei Xu | 2005-05-31 |