(19)

(11)

EP 0 698 234 A1

(12)

(43) Date of publication: 28.02.1996 Bulletin 1996/09 (21) Application number: 94912005.0 (22) Date of filing: 29.03.1994

(51) International Patent Classification (IPC):  G03G 9/ 087( . ) G03G 9/ 097( . ) (86) International application number: PCT/GB1994/000654 (87) International publication number: WO 1994/023344 (13.10.1994 Gazette 1994/23)

(84) Designated Contracting States: BE CH DE FR GB IE IT LI NL (30) Priority: 29.03.1993 GB 19930006456 (71) Applicant: ZENECA LIMITED London W1Y 6LN (GB)	(72) Inventors: CAMPBELL, James, Stanley Manchester M45 6TX (GB) GREGORY, Peter Bolton Manchester BL3 4UN (GB) (74) Representative: Pugsley, Roger Graham, et al  Intellectual Property Group Zeneca Specialties P.O. Box 42 Hexagon House Blackley Manchester M9 8ZS Manchester M9 8ZS (GB)