(19)

(11)

EP 2 556 392 A2

(12)

(88) Date of publication A3: 02.02.2012 (43) Date of publication: 13.02.2013 Bulletin 2013/07 (21) Application number: 11766768.3 (22) Date of filing: 07.04.2011

(51) International Patent Classification (IPC):  G01V 9/00(2006.01) G01D 21/02(2006.01) E21B 47/00(2012.01) (86) International application number: PCT/US2011/031648 (87) International publication number: WO 2011/127331 (13.10.2011 Gazette 2011/41)

(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 (30) Priority: 17.12.2010 US 972073 07.04.2010 US 321648 P (71) Applicant: Mc10, Inc. Cambridge, MA 02140 (US)	(72) Inventors: DE GRAFF, Bassel San Juan (TT) ARORA, William J. Boston, Massachusetts 02116 (US) GHAFFARI, Roozbeh Cambridge, Massachusetts 02142 (US) CALLSEN, Gilman Malden, Massachusetts 02148 (US) DOWLING, Kevin Westford, Massachusetts 01886 (US) (74) Representative: Driver, Virginia Rozanne  Page White & Farrer Bedford House John Street London WC1N 2BF London WC1N 2BF (GB)