(19)

(11)

EP 0 543 887 A1

(12)

(43) Date of publication: 02.06.1993 Bulletin 1993/22 (21) Application number: 91914823.0 (22) Date of filing: 14.08.1991

(51) International Patent Classification (IPC):  F21V 23/ 02( . ) H05B 39/ 00( . ) (86) International application number: PCT/GB1991/001378 (87) International publication number: WO 1992/003897 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: DE FR GB (30) Priority: 14.08.1990 GB 19900017778 (71) Applicant: YORKLITE LIMITED Middlesbrough TS2 1PS (GB)	(72) Inventor: RAY, Peter Stokesley North Yorkshire TS9 7EZ (GB) (74) Representative: Gibbs, Christopher Stephen  Haseltine Lake & Co. Hazlitt House 28 Southampton Buildings Chancery Lane, London WC2A 1AT Chancery Lane, London WC2A 1AT (GB)