(19)

(11)

EP 0 767 934 A1

(12)

(43) Date of publication: 16.04.1997 Bulletin 1997/16 (21) Application number: 95919523.0 (22) Date of filing: 22.05.1995

(51) International Patent Classification (IPC):  G03G 9/ 097( . ) (86) International application number: PCT/GB1995/001151 (87) International publication number: WO 1996/000932 (11.01.1996 Gazette 1996/03)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 29.06.1994 GB 19940013076 (71) Applicant: ZENECA LIMITED London W1Y 6LN (GB)	(72) Inventors: CAMPBELL, James, Stanley Whitefield Manchester M45 6TX (GB) GREGORY, Peter Bolton BL3 4UN (GB) FAWKES, David, Melville Marple Cheshire SK6 6PX (GB) (74) Representative: Kirk, Martin John  Intelectual Property Group, Zeneca Specialties, P.O. Box 42, Hexagon House, Blackley, Manchester M9 8ZS Blackley, Manchester M9 8ZS (GB)