(19)

(11)

EP 0 466 791 A1

(12)

(43) Date of publication: 22.01.1992 Bulletin 1992/04 (21) Application number: 90906278.0 (22) Date of filing: 10.04.1990

(51) International Patent Classification (IPC):  G07D 5/ 08( . ) G07F 1/ 04( . ) G07D 5/ 00( . ) (86) International application number: PCT/GB1990/000547 (87) International publication number: WO 1990/013097 (01.11.1990 Gazette 1990/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 14.04.1989 GB 19890008500 (71) Applicant: MARS INCORPORATED McLean Virginia 22101-3883 (US)	(72) Inventors: NUNN, Michael David Berkshire, SL5 7NP (GB) BRODIE, John, McCormick New House, Tape Lane Berkshire (GB) WATKINS, Keith, James Berkshire (GB) (74) Representative: Wright, Peter David John, et al  R.G.C. Jenkins & Co. 26 Caxton Street London SW1H 0RJ London SW1H 0RJ (GB)