(19)

(11)

EP 1 444 537 A2

(12)

(88) Date of publication A3: 12.02.2004 (43) Date of publication: 11.08.2004 Bulletin 2004/33 (21) Application number: 02768865.4 (22) Date of filing: 18.09.2002

(51) International Patent Classification (IPC)7: G02B 5/00, G02B 27/00 (86) International application number: PCT/US2002/029580 (87) International publication number: WO 2003/042725 (22.05.2003 Gazette 2003/21)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 09.11.2001 US 8467 (71) Applicant: 3M Innovative Properties Company St. Paul, MN 55133-3427 (US)	(72) Inventors: GIBBONS, Gordon, W. Saint Paul, MN 55133-3427 (US) PIEPEL, Andrew, J. Saint Paul, MN 55133-3427 (US) (74) Representative: VOSSIUS & PARTNER  Siebertstrasse 4 81675 München 81675 München (DE)