(19)

(11)

EP 0 422 127 A1

(12)

(43) Date of publication: 17.04.1991 Bulletin 1991/16 (21) Application number: 89908624.0 (22) Date of filing: 14.07.1989

(51) International Patent Classification (IPC):  C03C 8/ 10( . ) H01B 3/ 08( . ) H05K 1/ 03( . ) C03C 8/ 22( . ) H01L 23/ 498( . ) (86) International application number: PCT/US1989/003102 (87) International publication number: WO 1990/000966 (08.02.1990 Gazette 1990/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 19.07.1988 US 19880221105 13.07.1989 US 19890377551 (71) Applicant: FERRO CORPORATION Cleveland Ohio 44114-1183 (US)	(72) Inventors: GARDNER, Robert, D. Warrensville Hts., OH 44122 (US) HOPP, Dineen, M. Bedford, OH 44146 (US) SHAIKH, Aziz, S. Ventura, CA 93003 (US) ROBERTS, Gordon, J. Parma, OH 44134 (US) (74) Representative: Türk, Gille, Hrabal, Leifert  Brucknerstrasse 20 D-40593 Düsseldorf D-40593 Düsseldorf (DE)