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| US4526242 | 26 Mar 1982 | 2 Jul 1985 | Elisabeth Hochstrasser geb. Wack
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| US7484576 | 12 Feb 2007 | 3 Feb 2009 | | Jack element in communication with an electric motor and or generator |
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| US8011457 | 26 Feb 2008 | 6 Sep 2011 | Schlumberger Technology Corporation | Downhole hammer assembly |
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| US8191651 | 31 Mar 2011 | 5 Jun 2012 | | Sensor on a formation engaging member of a drill bit |
| US8201892 | 10 Dic 2007 | 19 Jun 2012 | | Holder assembly |
| US8205688 | 24 Jun 2009 | 26 Jun 2012 | | Lead the bit rotary steerable system |
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| US8225883 | 31 Mar 2009 | 24 Jul 2012 | Schlumberger Technology Corporation | Downhole percussive tool with alternating pressure differentials |
| US8240404 | 10 Sep 2008 | 14 Ago 2012 | | Roof bolt bit |
| USD620510 | 26 Feb 2008 | 27 Jul 2010 | Schlumberger Technology Corporation | Drill bit |
