(19)

(11)

EP 0 259 487 A1

(12)

(43) Date of publication: 16.03.1988 Bulletin 1988/11 (21) Application number: 87902878.0 (22) Date of filing: 04.12.1986

(51) International Patent Classification (IPC):  H04L 9/ 08( . ) (86) International application number: PCT/US1986/002644 (87) International publication number: WO 1987/005175 (27.08.1987 Gazette 1987/19)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 24.02.1986 US 19860832819 (71) Applicant: WEISS, Jeffrey A. Smithfield, RI 02917 (US)	(72) Inventor: WEISS, Jeffrey A. Smithfield, RI 02917 (US)