(19)

(11)

EP 0 241 540 A1

(12)

(43) Date of publication: 21.10.1987 Bulletin 1987/43 (21) Application number: 86906583.0 (22) Date of filing: 10.10.1986

(51) International Patent Classification (IPC):  B22D 11/ 06( . ) (86) International application number: PCT/US1986/002134 (87) International publication number: WO 1987/002285 (23.04.1987 Gazette 1987/09)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 11.10.1985 US 19850786789 11.03.1986 US 19860838659 (71) Applicant: NATIONAL ALUMINIUM CORPORATION Pittsburgh, PA 15222 (US)	(72) Inventor: VAUGHT, Charles, F. Bethel Park, PA 15102 (US)