(19)

(11)

EP 2 370 676 A1

(12)

(43) Date of publication: 05.10.2011 Bulletin 2011/40 (21) Application number: 09764679.8 (22) Date of filing: 02.12.2009

(51) International Patent Classification (IPC):  F01N 1/08(2006.01) F01N 3/28(2006.01) (86) International application number: PCT/US2009/066410 (87) International publication number: WO 2010/065637 (10.06.2010 Gazette 2010/23)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 02.12.2008 US 119243 P (71) Applicant: Donaldson Company, Inc. Minneapolis, MN 55440-1299 (US)	(72) Inventors: WHITTEN, Matthew, S. St. Paul MN 55104 (US) HOPPENSTEDT, Bruce, Bermard Lakeville MN 55044 (US) (74) Representative: Ström & Gulliksson AB  Box 4188 203 13 Malmö 203 13 Malmö (SE)