(19)

(11)

EP 0 708 686 A1

(12)

(43) Date of publication: 01.05.1996 Bulletin 1996/18 (21) Application number: 94919763.0 (22) Date of filing: 05.07.1994

(51) International Patent Classification (IPC):  C01B 31/ 08( . ) B01J 21/ 18( . ) B01J 41/ 18( . ) G01N 30/ 02( . ) B01J 20/ 20( . ) B01J 39/ 24( . ) C01B 31/ 16( . ) (86) International application number: PCT/GB1994/001452 (87) International publication number: WO 1995/001838 (19.01.1995 Gazette 1995/04)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 05.07.1993 GB 19930013871 (71) Applicant: SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOV. OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND London SW1A 2HB (GB)	(72) Inventors: HOLMES, Richard James Salisbury, Wiltshire SP4 OJQ (GB) HALL, Christopher Richard Wiltshire SP4 0JQ (GB) (74) Representative: Bowdery, Anthony Oliver, et al  Intellectual Property Department, R69 Building, Defence Evaluation & Research Agency Farnborough, Hampshire GU14 6TD Farnborough, Hampshire GU14 6TD (GB)