|
| US3989418 | 18 May 1973 | 2 Nov 1976 | Swanson Engineering Inc. | Fluid pump for use in explosive bore holes |
| US4076466 | 8 Abr 1976 | 28 Feb 1978 | Swanson Engineering, Inc. | Fluid pump for use in explosive bore holes |
| US4386654 | 11 May 1981 | 7 Jun 1983 | | Hydraulically operated downhole oil well pump |
| US4592427 | 19 Jun 1984 | 3 Jun 1986 | Hughes Tool Company | Through tubing progressing cavity pump |
| US4820135 | 9 Feb 1987 | 11 Abr 1989 | Shell Oil Company | Fluid driven pumping apparatus |
| US4828036 | 5 Ene 1987 | 9 May 1989 | Shell Oil Company | Apparatus and method for pumping well fluids |
| US4957161 | 15 May 1989 | 18 Sep 1990 | Institut Francais du Petrole | Device for pumping a fluid at the bottom of a well |
| US5015162 | 28 Nov 1989 | 14 May 1991 | | Attachment for an oil well screw pump system |
| US5143153 | 31 Jul 1991 | 1 Sep 1992 | | Rotary oil well pump and sucker rod lift |
| US5746582 | 23 Sep 1996 | 5 May 1998 | Atlantic Richfield Company | Through-tubing, retrievable downhole submersible electrical pump and method of using same |
| US6675902 | 25 Jun 2001 | 13 Ene 2004 | Weatherford/Lamb, Inc. | Progressive cavity wellbore pump and method of use in artificial lift systems |
| US6729391 | 14 Dic 2001 | 4 May 2004 | Kudu Industries Inc. | Insertable progressing cavity pump |
| US7874368 | 25 Sep 2008 | 25 Ene 2011 | National Oilwell Varco, L.P. | Insertable progressive cavity pump systems and methods of pumping a fluid with same |
| US8191640 | 8 Jun 2009 | 5 Jun 2012 | Smith International, Inc. | Universal pump holddown system |
