(19)

(11)

EP 0 172 889 A1

(12)

(43) Date of publication: 05.03.1986 Bulletin 1986/10 (21) Application number: 85901243.0 (22) Date of filing: 15.02.1985

(51) International Patent Classification (IPC):  H01L 23/ 14( . ) H01L 23/ 538( . ) H01L 29/ 06( . ) H01L 23/ 522( . ) H01L 23/ 64( . ) (86) International application number: PCT/US1985/000263 (87) International publication number: WO 1985/003806 (29.08.1985 Gazette 1985/19)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 17.02.1984 US 19840581259 17.02.1984 US 19840581260 17.02.1984 US 19840581336 21.02.1984 US 19840582079 (71) Applicant: AT&T Corp. New York, NY 10013-2412 (US)	(72) Inventors: NG, Kwok, Kwok Union, NJ 07083 (US) SZE, Simon, Min Murray Hill, NJ 07974 (US) TAI, King, Lien Berkeley Heights, NJ 07922 (US) (74) Representative: Buckley, Christopher Simon Thirsk, et al  AT&T (UK) Ltd. 5 Mornington Road Woodford Green Essex IG8 0TU Woodford Green Essex IG8 0TU (GB)