(19)

(11)

EP 2 825 727 A2

(12)

(88) Date of publication A3: 25.09.2014 (43) Date of publication: 21.01.2015 Bulletin 2015/04 (21) Application number: 12871543.0 (22) Date of filing: 12.12.2012

(51) International Patent Classification (IPC):  E21B 34/10(2006.01) F16K 17/04(2006.01) (86) International application number: PCT/US2012/069186 (87) International publication number: WO 2013/137954 (19.09.2013 Gazette 2013/38)

(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: 15.03.2012 US 201261611543 P 13.04.2012 US 201213446195 (71) Applicant: Osborne, Lawrence Acton, CA 93510 (US)	(72) Inventor: Osborne, Lawrence Acton, CA 93510 (US) (74) Representative: Davies, Philip  Haseltine Lake LLP Redcliff Quay 120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB)