(19)

(11)

EP 0 187 811 A1

(12)

(43) Date of publication: 23.07.1986 Bulletin 1986/30 (21) Application number: 85903471.0 (22) Date of filing: 07.06.1985

(51) International Patent Classification (IPC):  C25D 3/ 50( . ) (86) International application number: PCT/US1985/001079 (87) International publication number: WO 1986/000652 (30.01.1986 Gazette 1986/03)

(84) Designated Contracting States: BE CH DE FR GB IT LI NL SE (30) Priority: 02.07.1984 US 19840627237 (71) Applicant: AT&T Corp. New York, NY 10013-2412 (US)	(72) Inventor: ABYS, Anthony, Joseph Bridgewater, New Jersey 08807 (US) (74) Representative: Johnston, Kenneth Graham  AT&T (UK) Ltd. 5 Mornington Road Woodford Green Essex, IG8 OTU Woodford Green Essex, IG8 OTU (GB)