(19)

(11)

EP 0 633 801 A1

(12)

(43) Date of publication: 18.01.1995 Bulletin 1995/03 (21) Application number: 93907944.0 (22) Date of filing: 29.03.1993

(51) International Patent Classification (IPC):  A62D 3/ 02( . ) B01J 31/ 24( . ) B01D 53/ 86( . ) (86) International application number: PCT/GB1993/000651 (87) International publication number: WO 1993/019811 (14.10.1993 Gazette 1993/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 01.04.1992 GB 19920007181 (71) Applicant: BIOTAL LIMITED Cardiff CF4 5DL (GB)	(72) Inventors: MANN, Stephen Philip Harston, Cambridgeshire CB2 5QQ (GB) FOOTE, Nicholas Peter Martin Linton, Cambridge CB1 6UF (GB) (74) Representative: Perry, Robert Edward, et al  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)