(19)

(11)

EP 2 877 697 A1

(12)

(43) Date of publication: 03.06.2015 Bulletin 2015/23 (21) Application number: 13823572.6 (22) Date of filing: 29.07.2013

(51) International Patent Classification (IPC):  E21C 37/12(2006.01) (86) International application number: PCT/US2013/052567 (87) International publication number: WO 2014/018977 (30.01.2014 Gazette 2014/05)

(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: 27.07.2012 US 201261676774 P (71) Applicant: Tempress Technologies, Inc. Kent, WA 98032 (US)	(72) Inventor: KOLLE, Jack J. Seattle, Washington 98119 (US) (74) Representative: Sessford, Russell  Forresters Skygarden Erika-Mann-Strasse 11 80636 München 80636 München (DE)