(19)

(11)

EP 0 673 275 A1

(12)

(43) Date of publication: 27.09.1995 Bulletin 1995/39 (21) Application number: 94903655.0 (22) Date of filing: 14.12.1993

(51) International Patent Classification (IPC):  B01J 49/ 00( . ) C02F 1/ 42( . ) (86) International application number: PCT/US1993/012201 (87) International publication number: WO 1994/013379 (23.06.1994 Gazette 1994/14)

(84) Designated Contracting States: BE DE FR GB IT (30) Priority: 14.12.1992 US 19920990471 (71) Applicant: ECOWATER SYSTEMS, INC. Woodbury, MN 55125 (US)	(72) Inventors: ZIMMERMAN, Jeffrey, A. Blaine, MN 55484 (US) MARSHALL, Dave St. Paul, MN 55116 (US) LARSON, Ralph Bayport, MN 55003 (US) (74) Representative: Hector, Annabel Mary  W.P. Thompson & Co. Celcon House 289-293 High Holborn GB-London WC1V 7HU GB-London WC1V 7HU (GB)