(19)

(11)

EP 0 970 521 A1

(12)

(43) Date of publication: 12.01.2000 Bulletin 2000/02 (21) Application number: 97907926.6 (22) Date of filing: 27.02.1997

(51) International Patent Classification (IPC)7: H01L 23/12 (86) International application number: PCT/US9703/116 (87) International publication number: WO 9735/343 (25.09.1997 Gazette 1997/41)

(84) Designated Contracting States: GB (30) Priority: 18.03.1996 US 617233 (71) Applicant: OLIN CORPORATION New Haven, CT 06511-1837 (US)	(72) Inventor: HOFFMAN, Paul, R. Phoenix, AZ 85044 (US) (74) Representative: Klunker . Schmitt-Nilson . Hirsch  Winzererstrasse 106 80797 München 80797 München (DE)