(19)

(11)

EP 0 864 159 A1

(12)

(43) Date of publication: 16.09.1998 Bulletin 1998/38 (21) Application number: 96940127.0 (22) Date of filing: 26.11.1996

(51) International Patent Classification (IPC):  G21B 3/ 00( . ) H01L 35/ 28( . ) G21D 9/ 00( . ) (86) International application number: PCT/IT1996/000226 (87) International publication number: WO 1997/020320 (05.06.1997 Gazette 1997/24)

(84) Designated Contracting States: DE ES FR GB IT NL SE (30) Priority: 30.11.1995 IT 1995MI02502 (71) Applicant: STMicroelectronics S.r.l. 20041 Agrate Brianza (Milano) (IT)	(72) Inventor: MASTROMATTEO, Ubaldo I-20010 Cornaredo (IT) (74) Representative: Botti, Mario  Porta, Checcacci & Botti S.r.l. Viale Sabotino 19/2 20135 Milano 20135 Milano (IT)