|
| US4217966 | 26 Ene 1978 | 19 Ago 1980 | Smith International, Inc. | Junk basket, bit and reamer stabilizer |
| US4557339 | 30 Dic 1982 | 10 Dic 1985 | Hughes Tool Company | Borehole conditioning apparatus |
| US4583604 | 19 Oct 1984 | 22 Abr 1986 | Hytech International, Inc. | Roller reamer with rotatably positioned bearing block |
| US4776410 | 24 Jun 1987 | 11 Oct 1988 | Oil Patch Group Inc. | Stabilizing tool for well drilling |
| US5456312 | 17 Oct 1994 | 10 Oct 1995 | Baker Hughes Incorporated | Downhole milling tool |
| US5810079 | 10 Oct 1995 | 22 Sep 1998 | Baker Hughes Incorporated | Downhole milling tool |
| US5899268 | 28 Oct 1997 | 4 May 1999 | Baker Hughes Incorporated | Downhole milling tool |
| US7000713 | 22 Ago 2003 | 21 Feb 2006 | NQL Energy Services, Ltd. | Blockless reamer |
| US7048064 | 12 Sep 2003 | 23 May 2006 | | Multi-unit centralizer |
| US7484920 | 23 Sep 2005 | 3 Feb 2009 | Hilti Aktiengesellschaft | Thread-forming screw |
