(19)

(11)

EP 0 871 530 A1

(12)

(43) Date of publication: 21.10.1998 Bulletin 1998/43 (21) Application number: 97925635.0 (22) Date of filing: 20.05.1997

(51) International Patent Classification (IPC):  B01D 27/ 07( . ) B01D 35/ 147( . ) B01D 29/ 05( . ) B01D 46/ 10( . ) (86) International application number: PCT/US1997/008452 (87) International publication number: WO 1997/044115 (27.11.1997 Gazette 1997/51)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 23.05.1996 US 19960652229 11.09.1996 US 19960714021 11.02.1997 US 19970799657 (71) Applicant: FILTERTEK, INC. Hebron, Illinois 60034 (US)	(72) Inventors: MICHALOWSKI, Ronald, F. Wauconda, IL 60084 (US) PARNELL, Douglas, R. Spring Grove, IL 60081 (US) (74) Representative: Bayliss, Geoffrey Cyril  BOULT WADE TENNANT, 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)