Inventor
SANDBERG CHESTER LEDLIE
US18 patents
⚠️ This page may combine multiple inventors who share the name “SANDBERG CHESTER LEDLIE”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SHELL OIL CO
9 patentsUS8355623B2Jan 15, 2013
Temperature limited heaters with high power factors
SHELL OIL CO75 citations99
US7559367B2Jul 14, 2009
Temperature limited heater with a conduit substantially electrically isolated from the formation
SHELL OIL CO205 citations99
US7490665B2Feb 17, 2009
Variable frequency temperature limited heaters
SHELL OIL CO154 citations99
US7481274B2Jan 27, 2009
Temperature limited heaters with relatively constant current
SHELL OIL CO152 citations99
US7431076B2Oct 7, 2008
Temperature limited heaters using modulated DC power
SHELL OIL CO158 citations99
US7353872B2Apr 8, 2008
Start-up of temperature limited heaters using direct current (DC)
SHELL OIL CO159 citations99
US7831133B2Nov 9, 2010
Insulated conductor temperature limited heater for subsurface heating coupled in a three-phase WYE configuration
SHELL OIL CO129 citations98
US7121341B2Oct 17, 2006
Conductor-in-conduit temperature limited heaters
SHELL OIL CO205 citations98
US7575052B2Aug 18, 2009
In situ conversion process utilizing a closed loop heating system
SHELL OIL CO149 citations96
SANDBERG CHESTER LEDLIE
3 patentsUS8238730B2Aug 7, 2012
High voltage temperature limited heaters
SANDBERG CHESTER LEDLIE56 citations96
US8224164B2Jul 17, 2012
Insulated conductor temperature limited heaters
SANDBERG CHESTER LEDLIE50 citations96
US8224163B2Jul 17, 2012
Variable frequency temperature limited heaters
SANDBERG CHESTER LEDLIE1 citations61