(19)

(11)

EP 1 606 422 A2

(12)

(88) Date of publication A3: 03.02.2005 (43) Date of publication: 21.12.2005 Bulletin 2005/51 (21) Application number: 04758148.3 (22) Date of filing: 24.03.2004

(51) International Patent Classification (IPC)7: C13D 3/00, C13D 3/06, C13J 1/02 (86) International application number: PCT/US2004/009241 (87) International publication number: WO 2004/085684 (07.10.2004 Gazette 2004/41)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 24.03.2003 US 457516 P (71) Applicant: Nalco Company Naperville, IL 60563-1198 (US)	(72) Inventor: SANDERS, David, O. Loveland, CO 80538 (US) (74) Representative: Want, Clifford James et al Harrison Goddard Foote 40-43 Chancery Lane London WC2A 1JA London WC2A 1JA (GB)