|
| US4372378 | 18 Mar 1981 | 8 Feb 1983 | The BDM Corporation | Shut-in device for stopping the flow of high pressure fluids |
| US5040605 | 29 Jun 1990 | 20 Ago 1991 | Union Oil Company of California | Oil recovery method and apparatus |
| US5829519 | 10 Mar 1997 | 3 Nov 1998 | Enhanced Energy, Inc. | Subterranean antenna cooling system |
| US5829528 | 31 Mar 1997 | 3 Nov 1998 | Enhanced Energy, Inc. | Ignition suppression system for down hole antennas |
| US6328110 | 20 Ene 2000 | 11 Dic 2001 | Elf Exploration Production | Process for destroying a rigid thermal insulator positioned in a confined space |
| US6419018 | 17 Mar 2000 | 16 Jul 2002 | Halliburton Energy Services, Inc. | Subterranean well completion apparatus with flow assurance system and associated methods |
| US6769487 | 11 Dic 2002 | 3 Ago 2004 | Schlumberger Technology Corporation | Apparatus and method for actively cooling instrumentation in a high temperature environment |