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(11)

EP 0 765 383 A1

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(43) Date of publication: 02.04.1997 Bulletin 1997/14 (21) Application number: 95910325.0 (22) Date of filing: 24.02.1995

(51) International Patent Classification (IPC):  C11D 1/ 72( . ) C11D 1/ 825( . ) C11D 17/ 00( . ) C11D 1/ 722( . ) C11D 7/ 06( . ) C11D 17/ 04( . ) (86) International application number: PCT/US1995/002283 (87) International publication number: WO 1995/034633 (21.12.1995 Gazette 1996/02)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 14.06.1994 US 19940259623 (71) Applicant: ECOLAB INC. St. Paul Minnesota 55102 (US)

(72) Inventors: LENTSCH, Steven, E. St. Paul, MN 55115 (US) BURCH, Wendell, D. Elko, MN 55020 (US) OAKES, Thomas, R. Marine, MN 55047 (US) KELLER, Cynthia, A. Richfield, MN 55423 (US) MAJEWSKI, Donna, M. Lino Lakes, MN 55014 (US) DONOVAN, Daniel, J. Mendota Heights, MN 55118 (US) (74) Representative: Belcher, Simon James  Urquhart-Dykes & Lord Tower House Merrion Way Leeds LS2 8PA Leeds LS2 8PA (GB)