(19)

(11)

EP 2 032 776 A1

(12)

(43) Date of publication: 11.03.2009 Bulletin 2009/11 (21) Application number: 07798060.5 (22) Date of filing: 04.06.2007

(51) International Patent Classification (IPC):  E04F 21/16(2006.01) E04F 21/24(2006.01) (86) International application number: PCT/US2007/070310 (87) International publication number: WO 2007/146635 (21.12.2007 Gazette 2007/51)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 08.06.2006 US 804233 P (71) Applicant: 3M Innovative Properties Company St. Paul MN 55133-3427 (US)	(72) Inventor: JOHNSON, Mitchell T., Saint Paul, Minnesota 55133-3427 (US) (74) Representative: von Kreisler Selting Werner  Bahnhofsvorplatz 1 Deichmannhaus am Dom 50667 Köln 50667 Köln (DE)