(19)

(11)

EP 1 293 071 A2

(12)

(88) Date of publication A3: 30.05.2002 (43) Date of publication: 19.03.2003 Bulletin 2003/12 (21) Application number: 01930641.4 (22) Date of filing: 23.04.2001

(51) International Patent Classification (IPC)7: H04L 12/58, H04L 29/06 (86) International application number: PCT/US0113/004 (87) International publication number: WO 0108/2553 (01.11.2001 Gazette 2001/44)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR (30) Priority: 25.04.2000 US 557618 (71) Applicant: Atabok, Inc. Newton,Massachusetts 02458 (US)	(72) Inventors: KOBATA, Hiroshi Brookline, MA 02446 (US) GAGNE, Robert Boston, MA 02120 (US) (74) Representative: Howe, Steven  Lloyd WiseCommonwealth House,1-19 New Oxford Street London WC1A 1LW London WC1A 1LW (GB)