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(11)

EP 1 097 359 A1

(12)

(43) Date of publication: 09.05.2001 Bulletin 2001/19 (21) Application number: 99933902.1 (22) Date of filing: 12.07.1999

(51) International Patent Classification (IPC)7: G01F 3/02 (86) International application number: PCT/US9915/693 (87) International publication number: WO 0004/348 (27.01.2000 Gazette 2000/04)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 14.07.1998 US 115324 15.10.1998 US 172815 (71) Applicant: 3M Innovative Properties Company Saint Paul, MN 55133-3427 (US)	(72) Inventors: HEINECKE, Steven, B. Saint Paul, MN 55133-3427 (US) SHAW, Robert Saint Paul, MN 55133-3427 (US) PETERSON, Donald, G. Saint Paul, MN 55133-3427 (US) (74) Representative: Meyers, Hans-Wilhelm, Dr.Dipl.-Chem. et al Patentanwältevon Kreisler-Selting-WernerPostfach 10 22 41 50462 Köln 50462 Köln (DE)