(19)

(11)

EP 2 748 432 A1

(12)

(43) Date of publication: 02.07.2014 Bulletin 2014/27 (21) Application number: 12825784.7 (22) Date of filing: 22.08.2012

(51) International Patent Classification (IPC):  E21D 21/00(2006.01) (86) International application number: PCT/US2012/051852 (87) International publication number: WO 2013/028754 (28.02.2013 Gazette 2013/09)

(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: 23.08.2011 CL 20652011 (71) Applicant: FCI Holdings Delaware, Inc. Wilmington, DE 19801 (US)	(72) Inventor: HIDALGO SALGADO, Mauricio, Antonio Santiago (CL) (74) Representative: Cohausz & Florack  Patent- und Rechtsanwälte Partnerschaftsgesellschaft Bleichstraße 14 40211 Düsseldorf 40211 Düsseldorf (DE)