|
| US4050515 | 27 Sep 1976 | 27 Sep 1977 | World Energy Systems | Insitu hydrogenation of hydrocarbons in underground formations |
| US4141417 | 9 Sep 1977 | 27 Feb 1979 | Institute of Gas Technology | Enhanced oil recovery |
| US4379591 | 21 Aug 1980 | 12 Apr 1983 | Occidental Oil Shale, Inc. | Two-stage oil shale retorting process and disposal of spent oil shale |
| US4448251 | 9 Dec 1982 | 15 May 1984 | UOP Inc. | In situ conversion of hydrocarbonaceous oil |
| US4597441 | 25 May 1984 | 1 Jul 1986 | World Energy Systems, Inc. | Recovery of oil by in situ hydrogenation |
| US4691771 | 15 Sep 1986 | 8 Sep 1987 | WorldEnergy Systems, Inc. | Recovery of oil by in-situ combustion followed by in-situ hydrogenation |
| US5105887 | 28 Feb 1991 | 21 Apr 1992 | Union Oil Company of California | Enhanced oil recovery technique using hydrogen precursors |
| US5950728 | 24 Jul 1997 | 14 Sep 1999 | | Method and apparatus for enhancing oil recovery |
| US6016867 | 24 Jun 1998 | 25 Jan 2000 | World Energy Systems, Incorporated | Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking |
| US6016868 | 24 Jun 1998 | 25 Jan 2000 | World Energy Systems, Incorporated | Production of synthetic crude oil from heavy hydrocarbons recovered by in situ hydrovisbreaking |
| US6026902 | 18 Dec 1998 | 22 Feb 2000 | | Method and apparatus for enhancing oil recovery |
| US6328104 | 24 Jan 2000 | 11 Dec 2001 | World Energy Systems Incorporated | Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking |
| US6581684 | 24 Apr 2001 | 24 Jun 2003 | Shell Oil Company | In Situ thermal processing of a hydrocarbon containing formation to produce sulfur containing formation fluids |
| US6588503 | 24 Apr 2001 | 8 Jul 2003 | Shell Oil Company | In Situ thermal processing of a coal formation to control product composition |
| US6588504 | 24 Apr 2001 | 8 Jul 2003 | Shell Oil Company | In situ thermal processing of a coal formation to produce nitrogen and/or sulfur containing formation fluids |
| US6591906 | 24 Apr 2001 | 15 Jul 2003 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with a selected oxygen content |
| US6591907 | 24 Apr 2001 | 15 Jul 2003 | Shell Oil Company | In situ thermal processing of a coal formation with a selected vitrinite reflectance |
| US6607033 | 24 Apr 2001 | 19 Aug 2003 | Shell Oil Company | In Situ thermal processing of a coal formation to produce a condensate |
| US6609570 | 24 Apr 2001 | 26 Aug 2003 | Shell Oil Company | In situ thermal processing of a coal formation and ammonia production |
| US6688387 | 24 Apr 2001 | 10 Feb 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce a hydrocarbon condensate |
| US6698515 | 24 Apr 2001 | 2 Mar 2004 | Shell Oil Company | In situ thermal processing of a coal formation using a relatively slow heating rate |
| US6702016 | 24 Apr 2001 | 9 Mar 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with heat sources located at an edge of a formation layer |
| US6708758 | 24 Apr 2001 | 23 Mar 2004 | Shell Oil Company | In situ thermal processing of a coal formation leaving one or more selected unprocessed areas |
| US6712135 | 24 Apr 2001 | 30 Mar 2004 | Shell Oil Company | In situ thermal processing of a coal formation in reducing environment |
| US6712136 | 24 Apr 2001 | 30 Mar 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using a selected production well spacing |
| US6712137 | 24 Apr 2001 | 30 Mar 2004 | Shell Oil Company | In situ thermal processing of a coal formation to pyrolyze a selected percentage of hydrocarbon material |
| US6715546 | 24 Apr 2001 | 6 Apr 2004 | Shell Oil Company | In situ production of synthesis gas from a hydrocarbon containing formation through a heat source wellbore |
| US6715547 | 24 Apr 2001 | 6 Apr 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to form a substantially uniform, high permeability formation |
| US6715548 | 24 Apr 2001 | 6 Apr 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce nitrogen containing formation fluids |
| US6715549 | 24 Apr 2001 | 6 Apr 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with a selected atomic oxygen to carbon ratio |
| US6719047 | 24 Apr 2001 | 13 Apr 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation in a hydrogen-rich environment |
| US6722429 | 24 Apr 2001 | 20 Apr 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation leaving one or more selected unprocessed areas |
| US6722430 | 24 Apr 2001 | 20 Apr 2004 | Shell Oil Company | In situ thermal processing of a coal formation with a selected oxygen content and/or selected O/C ratio |
| US6722431 | 24 Apr 2001 | 20 Apr 2004 | Shell Oil Company | In situ thermal processing of hydrocarbons within a relatively permeable formation |
| US6725920 | 24 Apr 2001 | 27 Apr 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to convert a selected amount of total organic carbon into hydrocarbon products |
| US6725921 | 24 Apr 2001 | 27 Apr 2004 | Shell Oil Company | In situ thermal processing of a coal formation by controlling a pressure of the formation |
| US6725928 | 24 Apr 2001 | 27 Apr 2004 | Shell Oil Company | In situ thermal processing of a coal formation using a distributed combustor |
| US6729395 | 24 Apr 2001 | 4 May 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with a selected ratio of heat sources to production wells |
| US6729396 | 24 Apr 2001 | 4 May 2004 | Shell Oil Company | In situ thermal processing of a coal formation to produce hydrocarbons having a selected carbon number range |
| US6729397 | 24 Apr 2001 | 4 May 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with a selected vitrinite reflectance |
| US6729401 | 24 Apr 2001 | 4 May 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation and ammonia production |
| US6732794 | 24 Apr 2001 | 11 May 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce a mixture with a selected hydrogen content |
| US6732795 | 24 Apr 2001 | 11 May 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to pyrolyze a selected percentage of hydrocarbon material |
| US6732796 | 24 Apr 2001 | 11 May 2004 | Shell Oil Company | In situ production of synthesis gas from a hydrocarbon containing formation, the synthesis gas having a selected H2 to CO ratio |
| US6736215 | 24 Apr 2001 | 18 May 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation, in situ production of synthesis gas, and carbon dioxide sequestration |
| US6739393 | 24 Apr 2001 | 25 May 2004 | Shell Oil Company | In situ thermal processing of a coal formation and tuning production |
| US6739394 | 24 Apr 2001 | 25 May 2004 | Shell Oil Company | Production of synthesis gas from a hydrocarbon containing formation |
| US6742587 | 24 Apr 2001 | 1 Jun 2004 | Shell Oil Company | In situ thermal processing of a coal formation to form a substantially uniform, relatively high permeable formation |
| US6742588 | 24 Apr 2001 | 1 Jun 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce formation fluids having a relatively low olefin content |
| US6742589 | 24 Apr 2001 | 1 Jun 2004 | Shell Oil Company | In situ thermal processing of a coal formation using repeating triangular patterns of heat sources |
| US6742593 | 24 Apr 2001 | 1 Jun 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using heat transfer from a heat transfer fluid to heat the formation |
| US6745831 | 24 Apr 2001 | 8 Jun 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation by controlling a pressure of the formation |
| US6745832 | 24 Apr 2001 | 8 Jun 2004 | Shell Oil Company | Situ thermal processing of a hydrocarbon containing formation to control product composition |
| US6745837 | 24 Apr 2001 | 8 Jun 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using a controlled heating rate |
| US6749021 | 24 Apr 2001 | 15 Jun 2004 | Shell Oil Company | In situ thermal processing of a coal formation using a controlled heating rate |
| US6752210 | 24 Apr 2001 | 22 Jun 2004 | Shell Oil Company | In situ thermal processing of a coal formation using heat sources positioned within open wellbores |
| US6758268 | 24 Apr 2001 | 6 Jul 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using a relatively slow heating rate |
| US6761216 | 24 Apr 2001 | 13 Jul 2004 | Shell Oil Company | In situ thermal processing of a coal formation to produce hydrocarbon fluids and synthesis gas |
| US6763886 | 24 Apr 2001 | 20 Jul 2004 | Shell Oil Company | In situ thermal processing of a coal formation with carbon dioxide sequestration |
| US6769483 | 24 Apr 2001 | 3 Aug 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using conductor in conduit heat sources |
| US6769485 | 24 Apr 2001 | 3 Aug 2004 | Shell Oil Company | In situ production of synthesis gas from a coal formation through a heat source wellbore |
| US6789625 | 24 Apr 2001 | 14 Sep 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using exposed metal heat sources |
| US6805195 | 24 Apr 2001 | 19 Oct 2004 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce hydrocarbon fluids and synthesis gas |
| US6820688 | 24 Apr 2001 | 23 Nov 2004 | Shell Oil Company | In situ thermal processing of coal formation with a selected hydrogen content and/or selected H/C ratio |
| US6866097 | 24 Apr 2001 | 15 Mar 2005 | Shell Oil Company | In situ thermal processing of a coal formation to increase a permeability/porosity of the formation |
| US6871707 | 24 Apr 2001 | 29 Mar 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with carbon dioxide sequestration |
| US6877554 | 24 Apr 2001 | 12 Apr 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using pressure and/or temperature control |
| US6877555 | 24 Apr 2002 | 12 Apr 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation while inhibiting coking |
| US6880633 | 24 Apr 2002 | 19 Apr 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation to produce a desired product |
| US6880635 | 24 Apr 2001 | 19 Apr 2005 | Shell Oil Company | In situ production of synthesis gas from a coal formation, the synthesis gas having a selected H2 to CO ratio |
| US6889769 | 24 Apr 2001 | 10 May 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with a selected moisture content |
| US6896053 | 24 Apr 2001 | 24 May 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using repeating triangular patterns of heat sources |
| US6902003 | 24 Apr 2001 | 7 Jun 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation having a selected total organic carbon content |
| US6902004 | 24 Apr 2001 | 7 Jun 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using a movable heating element |
| US6910536 | 24 Apr 2001 | 28 Jun 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using a natural distributed combustor |
| US6913078 | 24 Apr 2001 | 5 Jul 2005 | Shell Oil Company | In Situ thermal processing of hydrocarbons within a relatively impermeable formation |
| US6915850 | 24 Apr 2002 | 12 Jul 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation having permeable and impermeable sections |
| US6918442 | 24 Apr 2002 | 19 Jul 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation in a reducing environment |
| US6918443 | 24 Apr 2002 | 19 Jul 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation to produce hydrocarbons having a selected carbon number range |
| US6923257 | 24 Apr 2002 | 2 Aug 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation to produce a condensate |
| US6923258 | 12 Jun 2003 | 2 Aug 2005 | Shell Oil Company | In situ thermal processsing of a hydrocarbon containing formation to produce a mixture with a selected hydrogen content |
| US6929067 | 24 Apr 2002 | 16 Aug 2005 | Shell Oil Company | Heat sources with conductive material for in situ thermal processing of an oil shale formation |
| US6932155 | 24 Oct 2002 | 23 Aug 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation via backproducing through a heater well |
| US6948562 | 24 Apr 2002 | 27 Sep 2005 | Shell Oil Company | Production of a blending agent using an in situ thermal process in a relatively permeable formation |
| US6948563 | 24 Apr 2001 | 27 Sep 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation with a selected hydrogen content |
| US6951247 | 24 Apr 2002 | 4 Oct 2005 | Shell Oil Company | In situ thermal processing of an oil shale formation using horizontal heat sources |
| US6953087 | 24 Apr 2001 | 11 Oct 2005 | Shell Oil Company | Thermal processing of a hydrocarbon containing formation to increase a permeability of the formation |
| US6959761 | 24 Apr 2001 | 1 Nov 2005 | Shell Oil Company | In situ thermal processing of a coal formation with a selected ratio of heat sources to production wells |
| US6964300 | 24 Apr 2002 | 15 Nov 2005 | Shell Oil Company | In situ thermal recovery from a relatively permeable formation with backproduction through a heater wellbore |
| US6966372 | 24 Apr 2001 | 22 Nov 2005 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce oxygen containing formation fluids |
| US6966374 | 24 Apr 2002 | 22 Nov 2005 | Shell Oil Company | In situ thermal recovery from a relatively permeable formation using gas to increase mobility |
| US6969123 | 24 Oct 2002 | 29 Nov 2005 | Shell Oil Company | Upgrading and mining of coal |
| US6973967 | 24 Apr 2001 | 13 Dec 2005 | Shell Oil Company | Situ thermal processing of a coal formation using pressure and/or temperature control |
| US6981548 | 24 Apr 2002 | 3 Jan 2006 | Shell Oil Company | In situ thermal recovery from a relatively permeable formation |
| US6991031 | 24 Apr 2001 | 31 Jan 2006 | Shell Oil Company | In situ thermal processing of a coal formation to convert a selected total organic carbon content into hydrocarbon products |
| US6991032 | 24 Apr 2002 | 31 Jan 2006 | Shell Oil Company | In situ thermal processing of an oil shale formation using a pattern of heat sources |
| US6991033 | 24 Apr 2002 | 31 Jan 2006 | Shell Oil Company | In situ thermal processing while controlling pressure in an oil shale formation |
| US6991036 | 24 Apr 2002 | 31 Jan 2006 | Shell Oil Company | Thermal processing of a relatively permeable formation |
| US6991045 | 24 Oct 2002 | 31 Jan 2006 | Shell Oil Company | Forming openings in a hydrocarbon containing formation using magnetic tracking |
| US6994160 | 24 Apr 2001 | 7 Feb 2006 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce hydrocarbons having a selected carbon number range |
| US6994161 | 24 Apr 2001 | 7 Feb 2006 | | In situ thermal processing of a coal formation with a selected moisture content |
| US6994168 | 24 Apr 2001 | 7 Feb 2006 | | In situ thermal processing of a hydrocarbon containing formation with a selected hydrogen to carbon ratio |
| US6994169 | 24 Apr 2002 | 7 Feb 2006 | Shell Oil Company | In situ thermal processing of an oil shale formation with a selected property |
| US6997255 | 24 Apr 2001 | 14 Feb 2006 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation in a reducing environment |
| US6997518 | 24 Apr 2002 | 14 Feb 2006 | Shell Oil Company | In situ thermal processing and solution mining of an oil shale formation |
| US7004247 | 24 Apr 2002 | 28 Feb 2006 | Shell Oil Company | Conductor-in-conduit heat sources for in situ thermal processing of an oil shale formation |
| US7004251 | 24 Apr 2002 | 28 Feb 2006 | Shell Oil Company | In situ thermal processing and remediation of an oil shale formation |
| US7011154 | 24 Oct 2002 | 14 Mar 2006 | Shell Oil Company | In situ recovery from a kerogen and liquid hydrocarbon containing formation |
| US7013972 | 24 Apr 2002 | 21 Mar 2006 | Shell Oil Company | In situ thermal processing of an oil shale formation using a natural distributed combustor |
| US7017661 | 24 Apr 2001 | 28 Mar 2006 | Shell Oil Company | Production of synthesis gas from a coal formation |
| US7032660 | 24 Apr 2002 | 25 Apr 2006 | Shell Oil Company | In situ thermal processing and inhibiting migration of fluids into or out of an in situ oil shale formation |
| US7036583 | 24 Apr 2001 | 2 May 2006 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to increase a porosity of the formation |
| US7040398 | 24 Apr 2002 | 9 May 2006 | Shell Oil Company | In situ thermal processing of a relatively permeable formation in a reducing environment |
| US7040399 | 24 Apr 2002 | 9 May 2006 | Shell Oil Company | In situ thermal processing of an oil shale formation using a controlled heating rate |
| US7040400 | 24 Apr 2002 | 9 May 2006 | Shell Oil Company | In situ thermal processing of a relatively impermeable formation using an open wellbore |
| US7051807 | 24 Apr 2002 | 30 May 2006 | Shell Oil Company | In situ thermal recovery from a relatively permeable formation with quality control |
| US7051808 | 24 Oct 2002 | 30 May 2006 | Shell Oil Company | Seismic monitoring of in situ conversion in a hydrocarbon containing formation |
| US7051811 | 24 Apr 2002 | 30 May 2006 | Shell Oil Company | In situ thermal processing through an open wellbore in an oil shale formation |
| US7055600 | 24 Apr 2002 | 6 Jun 2006 | Shell Oil Company | In situ thermal recovery from a relatively permeable formation with controlled production rate |
| US7063145 | 24 Oct 2002 | 20 Jun 2006 | Shell Oil Company | Methods and systems for heating a hydrocarbon containing formation in situ with an opening contacting the earth's surface at two locations |
| US7066254 | 24 Oct 2002 | 27 Jun 2006 | Shell Oil Company | In situ thermal processing of a tar sands formation |
| US7066257 | 24 Oct 2002 | 27 Jun 2006 | Shell Oil Company | In situ recovery from lean and rich zones in a hydrocarbon containing formation |
| US7073578 | 24 Oct 2003 | 11 Jul 2006 | Shell Oil Company | Staged and/or patterned heating during in situ thermal processing of a hydrocarbon containing formation |
| US7077198 | 24 Oct 2002 | 18 Jul 2006 | Shell Oil Company | In situ recovery from a hydrocarbon containing formation using barriers |
| US7077199 | 24 Oct 2002 | 18 Jul 2006 | Shell Oil Company | In situ thermal processing of an oil reservoir formation |
| US7086465 | 24 Oct 2002 | 8 Aug 2006 | Shell Oil Company | In situ production of a blending agent from a hydrocarbon containing formation |
| US7086468 | 24 Apr 2001 | 8 Aug 2006 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using heat sources positioned within open wellbores |
| US7090013 | 24 Oct 2002 | 15 Aug 2006 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation to produce heated fluids |
| US7096941 | 24 Apr 2001 | 29 Aug 2006 | Shell Oil Company | In situ thermal processing of a coal formation with heat sources located at an edge of a coal layer |
| US7096942 | 24 Apr 2002 | 29 Aug 2006 | Shell Oil Company | In situ thermal processing of a relatively permeable formation while controlling pressure |
| US7096953 | 24 Apr 2001 | 29 Aug 2006 | Shell Oil Company | In situ thermal processing of a coal formation using a movable heating element |
| US7100994 | 24 Oct 2002 | 5 Sep 2006 | Shell Oil Company | Producing hydrocarbons and non-hydrocarbon containing materials when treating a hydrocarbon containing formation |
| US7104319 | 24 Oct 2002 | 12 Sep 2006 | Shell Oil Company | In situ thermal processing of a heavy oil diatomite formation |
| US7114566 | 24 Oct 2002 | 3 Oct 2006 | Shell Oil Company | In situ thermal processing of a hydrocarbon containing formation using a natural distributed combustor |
| US7121341 | 24 Oct 2003 | 17 Oct 2006 | Shell Oil Company | Conductor-in-conduit temperature limited heaters |
| US7121342 | 23 Apr 2004 | 17 Oct 2006 | Shell Oil Company | Thermal processes for subsurface formations |
| US7128153 | 24 Oct 2002 | 31 Oct 2006 | Shell Oil Company | Treatment of a hydrocarbon containing formation after heating |
| US7156176 | 24 Oct 2002 | 2 Jan 2007 | Shell Oil Company | Installation and use of removable heaters in a hydrocarbon containing formation |
| US7165615 | 24 Oct 2002 | 23 Jan 2007 | Shell Oil Company | In situ recovery from a hydrocarbon containing formation using conductor-in-conduit heat sources with an electrically conductive material in the overburden |
| US7219734 | 24 Oct 2003 | 22 May 2007 | Shell Oil Company | Inhibiting wellbore deformation during in situ thermal processing of a hydrocarbon containing formation |
| US7225866 | 31 Jan 2006 | 5 Jun 2007 | Shell Oil Company | In situ thermal processing of an oil shale formation using a pattern of heat sources |
| US7360588 | 17 Oct 2006 | 22 Apr 2008 | Shell Oil Company | Thermal processes for subsurface formations |
| US7640980 | 7 Apr 2008 | 5 Jan 2010 | Shell Oil Company | Thermal processes for subsurface formations |
| US7650939 | 20 May 2007 | 26 Jan 2010 | Pioneer Energy, Inc. | Portable and modular system for extracting petroleum and generating power |
| US7654330 | 19 May 2007 | 2 Feb 2010 | Pioneer Energy, Inc. | Apparatus, methods, and systems for extracting petroleum using a portable coal reformer |
| US7735777 | 6 Jun 2006 | 15 Jun 2010 | Pioneer Astronautics | Apparatus for generation and use of lift gas |
| US7735935 | 1 Jun 2007 | 15 Jun 2010 | Shell Oil Company | In situ thermal processing of an oil shale formation containing carbonate minerals |
| US7871036 | 26 Apr 2010 | 18 Jan 2011 | Pioneer Astronautics | Apparatus for generation and use of lift gas |
| US7942203 | 4 Jan 2010 | 17 May 2011 | Shell Oil Company | Thermal processes for subsurface formations |
| US8047007 | 3 May 2011 | 1 Nov 2011 | Pioneer Energy Inc. | Methods for generating electricity from carbonaceous material with substantially no carbon dioxide emissions |
| US8224163 | 24 Oct 2003 | 17 Jul 2012 | Shell Oil Company | Variable frequency temperature limited heaters |
| US8224164 | 24 Oct 2003 | 17 Jul 2012 | Shell Oil Company | Insulated conductor temperature limited heaters |
| US8225866 | 21 Jul 2010 | 24 Jul 2012 | Shell Oil Company | In situ recovery from a hydrocarbon containing formation |
| US8230921 | 30 Sep 2008 | 31 Jul 2012 | UOP LLC | Oil recovery by in-situ cracking and hydrogenation |
| US8233782 | 29 Sep 2010 | 31 Jul 2012 | Shell Oil Company | Grouped exposed metal heaters |
| US8238730 | 24 Oct 2003 | 7 Aug 2012 | Shell Oil Company | High voltage temperature limited heaters |
