(19)

(11)

EP 0 996 913 A1

(12)

(43) Date of publication: 03.05.2000 Bulletin 2000/18 (21) Application number: 98935873.4 (22) Date of filing: 22.07.1998

(51) International Patent Classification (IPC)7: G06F 17/60 (86) International application number: PCT/US9815/058 (87) International publication number: WO 9905/627 (04.02.1999 Gazette 1999/05)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 25.07.1997 ZA 9706663 (71) Applicant: Perseus Administration (Prorietary) Limited Strand,Western Cape 7140 (ZA)	(72) Inventors: DAVIS, Roelof, Daniel, Jacobus Gautent 1724 (ZA) RABE, Frederick, Jacobus Gauteng 2092 (ZA) (74) Representative: Haley, Stephen  Gill Jennings & Every,Broadgate House,7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)