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(11)

EP 1 793 925 A2

(12)

(88) Date of publication A3: 03.08.2006 (43) Date of publication: 13.06.2007 Bulletin 2007/24 (21) Application number: 05792898.8 (22) Date of filing: 25.08.2005

(51) International Patent Classification (IPC):  B01J 20/28(2006.01) B01D 53/04(2006.01) B01J 20/32(2006.01) (86) International application number: PCT/US2005/030577 (87) International publication number: WO 2006/026517 (09.03.2006 Gazette 2006/10)

(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 LV MC NL PL PT RO SE SI SK TR (30) Priority: 27.08.2004 US 927708 27.08.2004 US 928776 17.12.2004 US 16013 (71) Applicant: DONALDSON COMPANY, INC. Minneapolis, MN 55440-1299 (US)	(72) Inventors: DALLAS, Andrew, James Apple Valley, MN 55124 (US) DING, Lefei Falcon Heights, MN 55108 (US) JORIMAN, Jon, Dennis Little Canada, MN 55117 (US) (74) Representative: Speiser, Dieter K. et al Eisenführ, Speiser & Partner Patentanwälte Rechtsanwälte Postfach 10 60 78 28060 Bremen 28060 Bremen (DE)