(19)

(11)

EP 2 417 310 A1

(12)

(43) Date of publication: 15.02.2012 Bulletin 2012/07 (21) Application number: 10714089.9 (22) Date of filing: 06.04.2010

(51) International Patent Classification (IPC):  E04C 5/06(2006.01) (86) International application number: PCT/IB2010/051483 (87) International publication number: WO 2010/116323 (14.10.2010 Gazette 2010/41)

(84) Designated Contracting States: 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 SE SI SK SM TR (30) Priority: 06.04.2009 EP 09157384 (71) Applicant: École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne (CH)	(72) Inventors: MUTTONI, Aurelio CH-1112 Echichens (CH) FERNÁNDEZ RUIZ, Miguel CH-1112 Echichens (CH) (74) Representative: Schneider Feldmann AG Patent- und Markenanwälte  Beethovenstrasse 49 Postfach 2792 8022 Zürich 8022 Zürich (CH)