(19)

(11)

EP 0 941 638 A1

(12)

(43) Date of publication: 15.09.1999 Bulletin 1999/37 (21) Application number: 97909500.0 (22) Date of filing: 24.10.1997

(51) International Patent Classification (IPC):  H02M 3/ 338( . ) H05B 41/ 34( . ) (86) International application number: PCT/GB1997/002933 (87) International publication number: WO 1998/018298 (30.04.1998 Gazette 1998/17)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GR IE IT LI LU MC NL PT SE (30) Priority: 24.10.1996 GB 19960022133 (71) Applicant: Nicotech Limited Kings Langley, Hertfordshire WD4 8HD (GB)	(72) Inventor: HEFTMAN, George Bishops Stortford,Hertfordshire CM23 2RY (GB) (74) Representative: Coles, Graham Frederick  Graham Coles & Co. 24 Seeleys Road Beaconsfield Buckinghamshire HP9 1SZ Beaconsfield Buckinghamshire HP9 1SZ (GB)