(19)

(11)

EP 0 814 886 A1

(12)

(43) Date of publication: 07.01.1998 Bulletin 1998/02 (21) Application number: 96908186.0 (22) Date of filing: 22.03.1996

(51) International Patent Classification (IPC):  B01D 21/ 00( . ) (86) International application number: PCT/GB1996/000688 (87) International publication number: WO 1996/029135 (26.09.1996 Gazette 1996/43)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 22.03.1995 ZA 19950002331 (71) Applicant: Ultrasep (Proprietary) Limited Boksburg North (ZA)	(72) Inventor: Ultrasep (Proprietary) Limited Boksburg North (ZA) (74) Representative: Rackham, Anthony Charles, et al  Lloyd Wise, Tregear & Co., Commonwealth House, 1-19 New Oxford Street London WC1A 1LW London WC1A 1LW (GB)