(19)

(11)

EP 0 835 059 A1

(12)

(43) Date of publication: 15.04.1998 Bulletin 1998/16 (21) Application number: 96920992.0 (22) Date of filing: 27.06.1996

(51) International Patent Classification (IPC):  A22B 3/ 06( . ) H05C 1/ 04( . ) H05C 1/ 00( . ) (86) International application number: PCT/GB1996/001545 (87) International publication number: WO 1997/001283 (16.01.1997 Gazette 1997/04)

(84) Designated Contracting States: DE DK ES FR GB IT NL (30) Priority: 27.06.1995 GB 19950013018 (71) Applicant: BRITISH TECHNOLOGY GROUP LIMITED London EC4M 7SB (GB)	(72) Inventors: KETTLEWELL, Peter, John Marston Moretaine, Bedford MK43 0PH (GB) SPARREY, Julian, Mark Bedford SG17 5AE (GB) GRIFFITHS, Paul Bedford MK41 7BP (GB) MEEKS, Ian, Raymond Wootton, Bedfordshire MK43 9PJ (GB) (74) Representative: Bingham, Ian Mark  British Technology Group Ltd., 10 Fleet Place London EC4M 7SB London EC4M 7SB (GB)