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(11)

EP 1 032 755 A1

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(43) Date of publication: 06.09.2000 Bulletin 2000/36 (21) Application number: 98922031.4 (22) Date of filing: 10.04.1998

(51) International Patent Classification (IPC)7: F01N 3/28 (86) International application number: PCT/US9807/515 (87) International publication number: WO 9925/964 (27.05.1999 Gazette 1999/21)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 17.11.1997 US 971851 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul,Minnesota 55133-3427 (US)	(72) Inventors: HORNBACK, Loyd, R., III Saint Paul, MN 55133-3427 (US) PEISERT, Joseph, C. 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)