(19)

(11)

EP 2 875 089 A1

(12)

(43) Date of publication: 27.05.2015 Bulletin 2015/22 (21) Application number: 13745264.5 (22) Date of filing: 19.07.2013

(51) International Patent Classification (IPC):  C09K 8/594(2006.01) F01K 25/10(2006.01) F02C 1/05(2006.01) F02C 6/14(2006.01) E21B 43/16(2006.01) F02C 1/00(2006.01) F02C 1/10(2006.01) F24J 3/08(2006.01) (86) International application number: PCT/US2013/051379 (87) International publication number: WO 2014/015307 (23.01.2014 Gazette 2014/04)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 20.07.2012 US 201213554868 (71) Applicants: Regents of the University of Minnesota Minneapolis, MN 55455 (US) Heat Mining Company LLC Rapid City, South Dakota 57701 (US)	(72) Inventors: SAAR, Martin O. St. Paul, Minnesota 55105 (US) RANDOLPH, Jimmy Bryan Minneapolis, Minnesota 55419 (US) KUEHN, Thomas H. Mahtomedi, Minnesota 55115 (US) CARPENTER, Kenneth San Diego, California 92103 (US) (74) Representative: LifeTech IP Spies Danner & Partner Patentanwälte PartG mbB  Elsenheimerstrasse 47a 80687 München 80687 München (DE)