|
| US4262757 | 4 Aug 1978 | 21 Apr 1981 | Hydronautics, Incorporated | Cavitating liquid jet assisted drill bit and method for deep-hole drilling |
| US4436166 | 17 Jul 1980 | 13 Mar 1984 | Gill Industries, Inc. | Downhole vortex generator and method |
| US4479558 | 5 Aug 1981 | 30 Oct 1984 | Gill Industries, Inc. | Drilling sub |
| US4512420 | 24 Jan 1984 | 23 Apr 1985 | Gill Industries, Inc. | Downhole vortex generator |
| US4577706 | 10 May 1984 | 25 Mar 1986 | NL Petroleum Products Limited | Rotary drill bits |
| US4673044 | 2 Aug 1985 | 16 Jun 1987 | Eastman Christensen Co. | Earth boring bit for soft to hard formations |
| US4694916 | 22 Sep 1986 | 22 Sep 1987 | R. C. Ltd. | Continuous coring drill bit |
| US4697654 | 12 Jul 1985 | 6 Oct 1987 | NL Petroleum Products Limited | Rotary drill bits |
| US4892159 | 29 Nov 1988 | 9 Jan 1990 | Exxon Production Research Company | Kerf-cutting apparatus and method for improved drilling rates |
| US5099934 | 21 Nov 1990 | 31 Mar 1992 | | Rotary drill bits |
| US5119892 | 21 Nov 1990 | 9 Jun 1992 | Reed Tool Company Limited | Notary drill bits |
| US5145017 | 7 Jan 1991 | 8 Sep 1992 | Exxon Production Research Company | Kerf-cutting apparatus for increased drilling rates |
| US5197554 | 19 Oct 1989 | 30 Mar 1993 | Shell Internationale Research Maatschappij B.V. The Netherlands | Rotary drill bit for drilling through sticky formations |
| US5460230 | 16 May 1994 | 24 Oct 1995 | Baroid Technology, Inc. | Core bit |
| US6112812 | 6 Jan 1998 | 5 Sep 2000 | Weatherford/Lamb, Inc. | Wellbore milling method |
| US7163070 | 26 Jul 2004 | 16 Jan 2007 | Hilti Aktiengesellschaft | Drill head |
| US7188682 | 30 Jun 2003 | 13 Mar 2007 | Smith International, Inc. | Multi-stage diffuser nozzle |
| US7457734 | 12 Oct 2006 | 25 Nov 2008 | ReedHycalog UK Limited | Representation of whirl in fixed cutter drill bits |
| US7520343 | 8 Feb 2005 | 21 Apr 2009 | Tesco Corporation | Retrievable center bit |
| US7621350 | 7 Dec 2007 | 24 Nov 2009 | Baker Hughes Incorporated | Impregnated bit with changeable hydraulic nozzles |
| US7695542 | 30 Nov 2007 | 13 Apr 2010 | Longyear TM, Inc. | Fiber-containing diamond-impregnated cutting tools |
| US7909119 | 28 Sep 2009 | 22 Mar 2011 | Longyear TM, Inc. | Drill bits with notches and enclosed slots |
| US7918288 | 22 Sep 2009 | 5 Apr 2011 | Longyear TM, Inc. | Drill bits with enclosed fluid slots and method |
| US7958954 | 25 Sep 2009 | 14 Jun 2011 | Longyear TM, Inc. | Drill bits with enclosed slots |
| US7975785 | 24 Nov 2008 | 12 Jul 2011 | Longyear TM, Inc. | Drilling systems including fiber-containing diamond-impregnated cutting tools |
| US8051929 | 21 Oct 2010 | 8 Nov 2011 | Longyear TM, Inc. | Core drill bits with enclosed fluid slots |
| US8146686 | 17 Sep 2009 | 3 Apr 2012 | Longyear TM, Inc. | Fiber-containing cutting tools |
| US8191445 | 24 Nov 2008 | 5 Jun 2012 | Longyear TM, Inc. | Methods of forming fiber-containing diamond-impregnated cutting tools |
| USD647114 | 26 Jan 2010 | 18 Oct 2011 | Longyear TM, Inc. | Drill bit with tapered waterway |
| USD647115 | 26 Jan 2010 | 18 Oct 2011 | Longyear TM, Inc. | Drill bit waterway |