|
| US3933209 | 1 Mar 1974 | 20 Jan 1976 | Tigre Tierra, Inc. | Drilling apparatus and technique using down-hole motor |
| US3945444 | 1 Apr 1975 | 23 Mar 1976 | The Anaconda Company | Split bit casing drill |
| US3990524 | 7 May 1975 | 9 Nov 1976 | Tigre Tierra, Inc. | Down-the-hole motor for rotary drill rod and process for drilling using the same |
| US4002213 | 7 May 1975 | 11 Jan 1977 | Tigre Tierra, Inc. | Down-the-hole motor for rotary drill rod and process for drilling using the same |
| US4183415 | 20 Nov 1978 | 15 Jan 1980 | Stenuick France | Drilling apparatus |
| US4196783 | 11 Jul 1978 | 8 Apr 1980 | Lofs Verkstads AB | Device for boring |
| US4296821 | 7 Feb 1980 | 27 Oct 1981 | | Drilling rig and conversion apparatus |
| US4408669 | 24 Apr 1978 | 11 Oct 1983 | Sandvik Aktiebolag | Means for drilling |
| US4415047 | 24 Nov 1980 | 15 Nov 1983 | | Downhole case driving apparatus for impact drills |
| US4545443 | 10 Jun 1983 | 8 Oct 1985 | Sandvik Aktiebolag | Means for drilling |
| US4852672 | 15 Aug 1988 | 1 Aug 1989 | | Drill apparatus having a primary drill and a pilot drill |
| US4979848 | 2 Nov 1989 | 25 Dec 1990 | | Drilling device |
| US5355966 | 7 Jul 1993 | 18 Oct 1994 | | Drilling method and an assembly for performing the method |
| US5503224 | 14 Feb 1995 | 2 Apr 1996 | Big Iron Drilling Ltd. | Casing drive apparatus |
| US5839519 | 8 Nov 1996 | 24 Nov 1998 | Sandvik AB | Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
| US6106200 | 12 May 1999 | 22 Aug 2000 | Techmo Entwicklungs-und Vertriebs GmbH ALWAG" Tunnelausbau Gesellschaft m.b.H. | Process and device for simultaneously drilling and lining a hole |
| US6675919 | 8 Nov 2001 | 13 Jan 2004 | Frank's Casing Crew and Rental Tools, Inc. | Tubular piling apparatus and method |
| US7520343 | 8 Feb 2005 | 21 Apr 2009 | Tesco Corporation | Retrievable center bit |