(19)

(11)

EP 0 252 968 A1

(12)

(43) Date of publication: 20.01.1988 Bulletin 1988/03 (21) Application number: 87900840.0 (22) Date of filing: 15.01.1987

(51) International Patent Classification (IPC):  C09K 3/ 00( . ) G01J 1/ 44( . ) H04N 5/ 16( . ) H04N 5/ 335( . ) C09K 3/ 18( . ) G01J 5/ 48( . ) H04N 5/ 33( . ) (86) International application number: PCT/GB1987/000018 (87) International publication number: WO 1987/004450 (30.07.1987 Gazette 1987/17)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.01.1986 GB 19860001161 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN London SW1A 2HB (GB)	(72) Inventor: SEWELL, John, Harold Hampshire GU11 3LY (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)