(19)

(11)

EP 0 408 718 A1

(12)

(43) Date of publication: 23.01.1991 Bulletin 1991/04 (21) Application number: 90902493.0 (22) Date of filing: 11.01.1990

(51) International Patent Classification (IPC):  C22C 9/ 08( . ) H01M 4/ 68( . ) C22F 1/ 12( . ) (86) International application number: PCT/US1990/000310 (87) International publication number: WO 1990/009462 (23.08.1990 Gazette 1990/20)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 09.02.1989 US 19890308221 (71) Applicant: ASARCO INCORPORATED New York, NY 10038 (US)	(72) Inventor: HAYDUK, Douglas Fruit Heights, UT 84037 (US) (74) Representative: Baillie, Iain Cameron, et al  c/o Ladas & Parry Altheimer Eck 2 D-80331 München D-80331 München (DE)