(19)

(11)

EP 0 912 233 A1

(12)

(43) Date of publication: 06.05.1999 Bulletin 1999/18 (21) Application number: 97931962.0 (22) Date of filing: 18.07.1997

(51) International Patent Classification (IPC):  B01D 61/ 04( . ) C02F 1/ 44( . ) B01D 61/ 58( . ) (86) International application number: PCT/GB1997/001948 (87) International publication number: WO 1998/003252 (29.01.1998 Gazette 1998/04)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE (30) Priority: 19.07.1996 GB 19960015191 20.08.1996 GB 19960017429 (71) Applicant: AW Creative Technologies Limited Huntingdon, Cambridgeshire PE18 6NZ (GB)	(72) Inventor: MURRER, Edwin, William, John Caldecote,Cambridge CB3 7NY (GB) (74) Representative: Perry, Robert Edward  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)