(19)

(11)

EP 1 042 551 A1

(12)

(43) Date of publication: 11.10.2000 Bulletin 2000/41 (21) Application number: 98962600.7 (22) Date of filing: 22.12.1998

(51) International Patent Classification (IPC)7: D06M 16/00, A61L 31/00, B01J 20/32, B01D 39/18 (86) International application number: PCT/GB9803/873 (87) International publication number: WO 9932/707 (01.07.1999 Gazette 1999/26)

(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: 22.12.1997 GB 9727119 (71) Applicant: RETROSCREEN LIMITED London E1 2AD (GB)	(72) Inventors: MCKAY, Ian, Alexander London E1 2AD (GB) OXFORD, John, Sidney London E1 2AD (GB) LAMBKIN, Robert London E1 2AD (GB) (74) Representative: Bassil, Nicholas Charles et al Kilburn & Strode20 Red Lion Street London WC1R 4PJ London WC1R 4PJ (GB)