Inventor · disambiguated record
Chester Ledlie Sandberg
Also filed as: SANDBERG CHESTER · SANDBERG CHESTER L · SANDBERG CHESTER LEDLIE
29 granted patents·2 pending applications·3,741 citations·filing 1980–2018
98Inventor score
Top patents by PatentIndex Score
31 records- 0199US7559367B2Temperature limited heater with a conduit substantially electrically isolated from the formationSHELL OIL CO·Filed 2006·Granted Jul 14, 2009·205 cites·30 claims
- 0299US7490665B2Variable frequency temperature limited heatersSHELL OIL CO·Filed 2005·Granted Feb 17, 2009·154 cites·26 claims
- 0399US7481274B2Temperature limited heaters with relatively constant currentSHELL OIL CO·Filed 2005·Granted Jan 27, 2009·152 cites·16 claims
- 0499US7431076B2Temperature limited heaters using modulated DC powerSHELL OIL CO·Filed 2005·Granted Oct 7, 2008·158 cites·30 claims
- 0599US7353872B2Start-up of temperature limited heaters using direct current (DC)SHELL OIL CO·Filed 2005·Granted Apr 8, 2008·159 cites·21 claims
- 0698US7831133B2Insulated conductor temperature limited heater for subsurface heating coupled in a three-phase WYE configurationSHELL OIL CO·Filed 2006·Granted Nov 9, 2010·129 cites·21 claims
- 0798US7360588B2Thermal processes for subsurface formationsSHELL OIL CO·Filed 2006·Granted Apr 22, 2008·158 cites·20 claims
- 0898US7121341B2Conductor-in-conduit temperature limited heatersSHELL OIL CO·Filed 2003·Granted Oct 17, 2006·205 cites·46 claims
- 0998US4785163AMethod for monitoring a heaterRAYCHEM CORP·Filed 1987·Granted Nov 15, 1988·186 cites·15 claims
- 1098US4698583AMethod of monitoring a heater for faultsRAYCHEM CORP·Filed 1985·Granted Oct 6, 1987·207 cites·7 claims
- 1198US4417782AFiber optic temperature sensingRAYCHEM CORP·Filed 1980·Granted Nov 29, 1983·192 cites·120 claims
- 1297US8355623B2Temperature limited heaters with high power factorsSHELL OIL CO·Filed 2005·Granted Jan 15, 2013·75 cites·46 claims
- 1397US7575052B2In situ conversion process utilizing a closed loop heating systemSHELL OIL CO·Filed 2006·Granted Aug 18, 2009·149 cites·19 claims
- 1497US7121342B2Thermal processes for subsurface formationsSHELL OIL CO·Filed 2004·Granted Oct 17, 2006·399 cites·63 claims
- 1596US4849611ASelf-regulating heater employing reactive componentsRAYCHEM CORP·Filed 1985·Granted Jul 18, 1989·444 cites·23 claims
- 1696US4733057ASheet heaterRAYCHEM CORP·Filed 1986·Granted Mar 22, 1988·236 cites·18 claims
- 1794US6288372B1Electric cable having braidless polymeric ground plane providing fault detectionTYCO ELECTRONICS CORP·Filed 1999·Granted Sep 11, 2001·281 cites·29 claims
- 1893US8881806B2Systems and methods for treating a subsurface formation with electrical conductorsXIE XUEYING·Filed 2009·Granted Nov 11, 2014·42 cites·38 claims
- 1989US8200072B2Temperature limited heaters for heating subsurface formations or wellboresVINEGAR HAROLD J·Filed 2003·Granted Jun 12, 2012·58 cites·142 claims
- 2088US8238730B2High voltage temperature limited heatersSANDBERG CHESTER LEDLIE·Filed 2003·Granted Aug 7, 2012·56 cites·60 claims
- 2187US8224164B2Insulated conductor temperature limited heatersSANDBERG CHESTER LEDLIE·Filed 2003·Granted Jul 17, 2012·50 cites·66 claims
- 2286US9290273B1Adaptive freeze, snow or ice protection system and methodTHOMPSON JAMES C·Filed 2013·Granted Mar 22, 2016·17 cites·42 claims
- 2385US8742604B2Systems and methods for combined flow control and electricity generationDYER TIMOTHY·Filed 2012·Granted Jun 3, 2014·12 cites·22 claims
- 2483US10273790B2System and method of producing oilPREC COMBUSTION INC·Filed 2015·Granted Apr 30, 2019·4 cites·15 claims
- 2581US9051829B2Perforated electrical conductors for treating subsurface formationsXIE XUEYING·Filed 2009·Granted Jun 9, 2015·12 cites·32 claims
- 2658US10760394B2System and method of producing oilPREC COMBUSTION INC·Filed 2018·Granted Sep 1, 2020·0 cites·7 claims
- 2756US10557336B2System and method of producing oilPREC COMBUSTION INC·Filed 2018·Granted Feb 11, 2020·0 cites·20 claims
- 2855US2013206748A1Mineral insulated skin effect heating cableSHELL OIL CO·Filed 2013·Application pending·0 cites
- 2951US2013043029A1High voltage temperature limited heatersSHELL OIL CO·Filed 2012·Application pending·0 cites
- 3039US8410892B2Conductive matrix power control system with biasing to cause tripping of the systemSANDBERG CHESTER L·Filed 2011·Granted Apr 2, 2013·0 cites·22 claims
- 3139US8224163B2Variable frequency temperature limited heatersSANDBERG CHESTER LEDLIE·Filed 2003·Granted Jul 17, 2012·1 cites·56 claims
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →