Sandberg; Chester Ledlie

Patent Applications and Registrations

Patent applications and USPTO patent grants for Sandberg; Chester Ledlie.The latest application filed is for "system and method of producing oil".

Company Profile

1.21.23

Sandberg; Chester Ledlie - Palo Alto CA
Sandberg; Chester Ledlie - US
Sandberg; Chester Ledlie - Palo Aklto CA

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
System and method of producing oil Grant 10,760,394 - Baird , et al. Sep	2020-09-01
System and method of producing oil Grant 10,557,336 - Baird , et al. Feb	2020-02-11
System and method of producing oil Grant 10,273,790 - Baird , et al.	2019-04-30
System And Method Of Producing Oil App 20190100984 - Baird; Benjamin ; et al.	2019-04-04
System And Method Of Producing Oil App 20180149005 - Baird; Benjamin ; et al.	2018-05-31
System And Method Of Producing Oil App 20150198025 - Baird; Benjamin ; et al.	2015-07-16
Perforated electrical conductors for treating subsurface formations Grant 9,051,829 - Xie , et al. June 9, 2	2015-06-09
Systems and methods for treating a subsurface formation with electrical conductors Grant 8,881,806 - Xie , et al. November 11, 2	2014-11-11
Mineral Insulated Skin Effect Heating Cable App 20130206748 - Vinegar; Harold J. ; et al.	2013-08-15
High Voltage Temperature Limited Heaters App 20130043029 - Vinegar; Harold J. ; et al.	2013-02-21
Temperature limited heaters with high power factors Grant 8,355,623 - Vinegar , et al. January 15, 2	2013-01-15
High voltage temperature limited heaters Grant 8,238,730 - Sandberg , et al. August 7, 2	2012-08-07
Insulated conductor temperature limited heaters Grant 8,224,164 - Sandberg , et al. July 17, 2	2012-07-17
Variable frequency temperature limited heaters Grant 8,224,163 - Sandberg , et al. July 17, 2	2012-07-17
Temperature limited heaters for heating subsurface formations or wellbores Grant 8,200,072 - Vinegar , et al. June 12, 2	2012-06-12
Insulated conductor temperature limited heater for subsurface heating coupled in a three-phase WYE configuration Grant 7,831,133 - Vinegar , et al. November 9, 2	2010-11-09
Perforated Electrical Conductors For Treating Subsurface Formations App 20100147521 - Xie; Xueying ; et al.	2010-06-17
Systems And Methods For Treating A Subsurface Formation With Electrical Conductors App 20100147522 - Xie; Xueying ; et al.	2010-06-17
In situ conversion process utilizing a closed loop heating system Grant 7,575,052 - Sandberg , et al. August 18, 2	2009-08-18
Continuous Subsurface Heater Temperature Measurement App 20090189617 - Burns; David ; et al.	2009-07-30
Temperature limited heater with a conduit substantially electrically isolated from the formation Grant 7,559,367 - Vinegar , et al. July 14, 2	2009-07-14
Electrically Isolating Insulated Conductor Heater App 20090120646 - Kim; Dong Sub ; et al.	2009-05-14
Variable frequency temperature limited heaters Grant 7,490,665 - Sandberg , et al. February 17, 2	2009-02-17
Temperature limited heaters with relatively constant current Grant 7,481,274 - Vinegar , et al. January 27, 2	2009-01-27
Temperature limited heaters using modulated DC power Grant 7,431,076 - Sandberg , et al. October 7, 2	2008-10-07
Start-up of temperature limited heaters using direct current (DC) Grant 7,353,872 - Sandberg April 8, 2	2008-04-08
Temperature limited heater with a conduit substantially electrically isolated from the formation App 20080017370 - Vinegar; Harold J. ; et al.	2008-01-24
Insulated conductor temperature limited heater for subsurface heating coupled in a three-phase wye configuration App 20070108201 - Vinegar; Harold J. ; et al.	2007-05-17
In situ conversion process utilizing a closed loop heating system App 20070045266 - Sandberg; Chester Ledlie ; et al.	2007-03-01
Conductor-in-conduit temperature limited heaters Grant 7,121,341 - Vinegar , et al. October 17, 2	2006-10-17
Temperature limited heaters with relatively constant current App 20060005968 - Vinegar; Harold J. ; et al.	2006-01-12
Temperature limited heaters using modulated DC power App 20050269089 - Sandberg, Chester Ledlie ; et al.	2005-12-08
Variable frequency temperature limited heaters App 20050269093 - Sandberg, Chester Ledlie ; et al.	2005-12-08
Start-up of temperature limited heaters using direct current (DC) App 20050269077 - Sandberg, Chester Ledlie	2005-12-08
Temperature limited heaters with high power factors App 20050269313 - Vinegar, Harold J. ; et al.	2005-12-08
Variable frequency temperature limited heaters App 20050006097 - Sandberg, Chester Ledlie ; et al.	2005-01-13
Conductor-in-conduit temperature limited heaters App 20040177966 - Vinegar, Harold J. ; et al.	2004-09-16
Temperature limited heaters for heating subsurface formations or wellbores App 20040146288 - Vinegar, Harold J. ; et al.	2004-07-29
High voltage temperature limited heaters App 20040144540 - Sandberg, Chester Ledlie ; et al.	2004-07-29
Insulated conductor temperature limited heaters App 20040140096 - Sandberg, Chester Ledlie ; et al.	2004-07-22

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