(19)

(11)

EP 2 516 749 A2

(12)

(88) Date of publication A3: 29.09.2011 (43) Date of publication: 31.10.2012 Bulletin 2012/44 (21) Application number: 10842500.0 (22) Date of filing: 14.12.2010

(51) International Patent Classification (IPC):  E01F 9/04(2006.01) E01F 9/011(2006.01) E01F 9/015(2006.01) (86) International application number: PCT/US2010/060209 (87) International publication number: WO 2011/084406 (14.07.2011 Gazette 2011/28)

(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: 21.12.2009 US 288581 P (71) Applicant: 3M Innovative Properties Company Saint Paul, MN 55133-3427 (US)	(72) Inventor: PHILIP, Blessen, Korah Bangalore 560001 (IN) (74) Representative: Vossius & Partner  Siebertstrasse 4 81675 München 81675 München (DE)