(19)

(11)

EP 0 220 271 A1

(12)

(43) Date of publication: 06.05.1987 Bulletin 1987/19 (21) Application number: 86902973.0 (22) Date of filing: 16.04.1986

(51) International Patent Classification (IPC):  B22F 9/ 14( . ) C22C 32/ 00( . ) C22C 1/ 05( . ) (86) International application number: PCT/US1986/000779 (87) International publication number: WO 1986/006366 (06.11.1986 Gazette 1986/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 26.04.1985 US 19850727456 (71) Applicant: Martin Marietta Corporation Bethesda Maryland 20817 (US)	(72) Inventors: CHRISTODOULOU, Leontios Baltimore, MD 21228 (US) NAGLE, Dennis, Charles Ellicott City, MD 21043 (US) BRUPBACHER, John, Michael Baltimore, MD 21228 (US) (74) Representative: Thomas, Roger Tamlyn, et al  D. Young & Co. 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)