(19)

(11)

EP 1 012 883 A1

(12)

(43) Date of publication: 28.06.2000 Bulletin 2000/26 (21) Application number: 98925866.0 (22) Date of filing: 15.06.1998

(51) International Patent Classification (IPC)7: H01L 27/146 (86) International application number: PCT/GB9801/734 (87) International publication number: WO 9858/411 (23.12.1998 Gazette 1998/51)

(84) Designated Contracting States: BE CH DE FR GB IT LI NL (30) Priority: 16.06.1997 GB 9712368 (71) Applicant: The Secretary of State for Defence Farnborough,Hampshire GU14 0LX (GB)	(72) Inventors: MARSHALL, Gillian, Fiona St. Andrews RoadMalvernWorcs. WR14 3PS (GB) COLLINS, Stephen St. Andrews RoadMalvernWorcs. WR14 3PS (GB) (74) Representative: Bowdery, Anthony Oliver  D/IPD DERA Formalities,A4 Building,Room G016,Ively Road Farnborough, Hants. GU14 OLX Farnborough, Hants. GU14 OLX (GB)