(19)

(11)

EP 1 218 852 A1

(12)

(43) Date of publication: 03.07.2002 Bulletin 2002/27 (21) Application number: 00964454.3 (22) Date of filing: 29.09.2000

(51) International Patent Classification (IPC)7: G06K 19/06 (86) International application number: PCT/GB0003/752 (87) International publication number: WO 0126/049 (12.04.2001 Gazette 2001/15)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 01.10.1999 GB 9923199 (71) Applicant: Sentec Ltd. Cambridge CB2 1GE (GB)	(72) Inventors: DAMES, Andrew Nicholas Cambridge CB4 1HU (GB) ENGLAND, James Mark Carson Milton,Cambridge CB4 6DG (GB) (74) Representative: Clarke, Gavin Richard Houghton  BTG International Ltd10 Fleet Place,Limeburner Lane London EC4M 7SB London EC4M 7SB (GB)