(19)

(11)

EP 0 457 828 A1

(12)

(43) Date of publication: 27.11.1991 Bulletin 1991/48 (21) Application number: 90903394.0 (22) Date of filing: 09.02.1990

(51) International Patent Classification (IPC):  A01K 1/ 015( . ) B01J 20/ 20( . ) (86) International application number: PCT/GB1990/000201 (87) International publication number: WO 1990/009099 (23.08.1990 Gazette 1990/20)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 10.02.1989 GB 19890003004 (71) Applicant: Mars G.B. Limited Slough Berkshire SL1 4LG (GB)	(72) Inventor: WALTERS, John Leicestershire LE14 4QE (GB) (74) Representative: Day, Jeremy John  REDDIE & GROSE 16 Theobalds Road London, WC1X 8PL London, WC1X 8PL (GB)