(19)

(11)

EP 0 327 556 A1

(12)

(43) Date of publication: 16.08.1989 Bulletin 1989/33 (21) Application number: 87906835.0 (22) Date of filing: 19.10.1987

(51) International Patent Classification (IPC):  C22C 21/ 00( . ) C22C 45/ 08( . ) (86) International application number: PCT/GB1987/000734 (87) International publication number: WO 1988/003178 (05.05.1988 Gazette 1988/10)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 21.10.1986 GB 19860025189 (71) Applicant: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and London SW1A 2HB (GB)

(72) Inventors: JONES, Edward Sheffield SIB 5YW (GB) TSAKIROPOULOS, Panayiotis Petersfield Hampshire (GB) PRATT, Charles, Robert West Glamorgan (GB) GARDINER, Robert, William Parnham, Surrey (GB) RESTALL, James, Edward Surrey GU15 1DN (GB) (74) Representative: Beckham, Robert William, et al  Defence Research Agency Intellectual Property Department DRA Farnborough Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)