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(11)

EP 1 697 681 A2

(12)

(88) Date of publication A3: 03.11.2005 (43) Date of publication: 06.09.2006 Bulletin 2006/36 (21) Application number: 04812644.5 (22) Date of filing: 01.12.2004

(51) International Patent Classification (IPC):  F21L 2/00(2006.01) (86) International application number: PCT/US2004/040182 (87) International publication number: WO 2005/057670 (23.06.2005 Gazette 2005/25)

(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 MC NL PL PT RO SE SI SK TR (30) Priority: 02.12.2003 US 726257 16.06.2004 US 869235 16.06.2004 US 869236 16.06.2004 US 869237 (71) Applicant: 3M Innovative Properties Company St. Paul, MN 55133-3427 (US)

(72) Inventors: AGUIRRE, Francis M., Saint Paul, Minnesota 55133-3427 (US) BENSON, Peter T., Saint Paul, Minnesota 55133-3427 (US) CRATON, Michele A., Saint Paul, Minnesota 55133-3427 (US) HENSON, Gordon D., Saint Paul, Minnesota 55133-3427 (US) HOFELDT, David L., Saint Paul, Minnesota 55133-3427 (US) LAI, Jack W., Saint Paul, Minnesota 55133-3427 (US) MEIS, Michael A., Saint Paul, Minnesota 55133-3427 (US) PHILLIPS, David L., Saint Paul, Minnesota 55133-3427 (US) (74) Representative: Vossius & Partner  Siebertstrasse 4 81675 München 81675 München (DE)