(19)

(11)

EP 0 152 421 A1

(12)

(43) Date of publication: 28.08.1985 Bulletin 1985/35 (21) Application number: 84902935.0 (22) Date of filing: 09.08.1984

(51) International Patent Classification (IPC):  H02M 3/ 338( . ) H02M 7/ 5383( . ) (86) International application number: PCT/GB1984/000276 (87) International publication number: WO 1985/000939 (28.02.1985 Gazette 1985/05)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 10.08.1983 GB 19830021520 (71) Applicant: RITCHIE, Gordon Stukeley Hackney London E9 7HP (GB)	(72) Inventor: RITCHIE, Gordon Stukeley Hackney London E9 7HP (GB) (74) Representative: Read, Matthew Charles  Venner Shipley & Co. 20 Little Britain London EC1A 7DH London EC1A 7DH (GB)