(19)

(11)

EP 0 843 928 A2

(12)

(43) Date of publication: 27.05.1998 Bulletin 1998/22 (21) Application number: 96913251.0 (22) Date of filing: 29.04.1996

(51) International Patent Classification (IPC):  G06F 21/ 00( . ) H04L 29/ 06( . ) (86) International application number: PCT/US1996/005933 (87) International publication number: WO 1997/004374 (06.02.1997 Gazette 1997/07)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 17.07.1995 US 19950503180 (71) Applicant: Billings, Roger E. Independence, MO 64057-3294 (US)	(72) Inventor: Billings, Roger E. Independence, MO 64057-3294 (US) (74) Representative: Doble, Richard George Vivian  212 Radnor House, 93/97 Regent Street London W1R 7TD London W1R 7TD (GB)