(19)

(11)

EP 1 214 135 A1

(12)

(43) Date of publication: 19.06.2002 Bulletin 2002/25 (21) Application number: 00960858.9 (22) Date of filing: 20.09.2000

(51) International Patent Classification (IPC)7: B01D 39/16, B01D 67/00 (86) International application number: PCT/GB0003/602 (87) International publication number: WO 0121/285 (29.03.2001 Gazette 2001/13)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 20.09.1999 GB 9922198 (71) Applicant: ISIS INNOVATION LIMITED Summertown,Oxford OX2 7BZ (GB)	(72) Inventors: TURBERFIELD, Andrew Jonathan Headington,Oxfordshire OX3 0AR (GB) DENNING, Robert Gordon Tootbaldon,Oxfordshire OX44 9NE (GB) (74) Representative: Nicholls, Michael John  J.A. KEMP & CO.14, South SquareGray's Inn London WC1R 5JJ London WC1R 5JJ (GB)