|
| US3987858 | 23 juin 1975 | 26 oct. 1976 | Bowen Tools, Inc. | Hydromechanical drilling jar |
| US4109736 | 28 mars 1977 | 29 août 1978 | | Double acting jar |
| US4186807 | 20 déc. 1977 | 5 févr. 1980 | | Optional up-blow, down-blow jar tool |
| US4200158 | 3 mars 1978 | 29 avr. 1980 | Lee E. Perkins | Fluid retarded accelerating jar with negative and positive pressure chambers |
| US4462471 | 27 oct. 1982 | 31 juil. 1984 | | Bidirectional fluid operated vibratory jar |
| US4715454 | 3 juin 1986 | 29 déc. 1987 | | Mechanical directional drilling jar with swivel means |
| US5103903 | 10 déc. 1990 | 14 avr. 1992 | | Jar |
| US5327982 | 13 oct. 1992 | 12 juil. 1994 | Raytec, Inc. | Drill string jar apparatus |
| US5624001 | 7 juin 1995 | 29 avr. 1997 | Dailey Petroleum Services Corp | Mechanical-hydraulic double-acting drilling jar |
| US5669458 | 1 mars 1996 | 23 sept. 1997 | | Rotary jar |
| US6290004 | 2 sept. 1999 | 18 sept. 2001 | | Hydraulic jar |
| US6481495 | 25 sept. 2000 | 19 nov. 2002 | | Downhole tool with electrical conductor |
| US7882906 | 3 nov. 2009 | 8 févr. 2011 | | Up-down vibratory drilling and jarring tool |
| US8230912 | 6 juil. 2010 | 31 juil. 2012 | Thru Tubing Solutions, Inc. | Hydraulic bidirectional jar |
