|
| US4452321 | 5 Oct 1981 | 5 Jun 1984 | Craelius AB | Device in core barrels |
| US4800969 | 24 Nov 1987 | 31 Ene 1989 | Longyear Company | Fast descent core barrel apparatus |
| US5020612 | 22 Feb 1990 | 4 Jun 1991 | Boart International Limited | Wire line core drilling apparatus |
| US5267620 | 8 Abr 1992 | 7 Dic 1993 | Longyear Company | Drilling latch apparatus |
| US5934393 | 19 Feb 1997 | 10 Ago 1999 | Boart Longyear International Holdings, Inc. | Core barrel apparatus |
| US6216804 | 29 Jul 1998 | 17 Abr 2001 | | Apparatus for recovering core samples under pressure |
| US6230825 | 30 Jun 2000 | 15 May 2001 | | Apparatus for recovering core samples under pressure |
| US6305482 | 30 Jun 2000 | 23 Oct 2001 | | Method and apparatus for transferring core sample from core retrieval chamber under pressure for transport |
| US6378631 | 30 Jun 2000 | 30 Abr 2002 | | Apparatus for recovering core samples at in situ conditions |
| US6659204 | 8 Feb 2001 | 9 Dic 2003 | Japan National Oil Corporation | Method and apparatus for recovering core samples under pressure |
| US7921926 | 6 Ene 2009 | 12 Abr 2011 | Longyear TM, Inc. | Jointed spearhead assembly |
| USD622293 | 15 Dic 2009 | 24 Ago 2010 | Longyear TM, Inc. | Spearhead |
| USD622294 | 16 Dic 2009 | 24 Ago 2010 | Longyear TM, Inc. | Spearhead base |
| USD622741 | 16 Dic 2009 | 31 Ago 2010 | Longyear TM, Inc. | Spearhead |
| USD624564 | 15 Dic 2009 | 28 Sep 2010 | Longyear TM, Inc. | Spearhead base |