(19)

(11)

EP 0 456 656 A1

(12)

(43) Date of publication: 21.11.1991 Bulletin 1991/47 (21) Application number: 90901861.0 (22) Date of filing: 18.01.1990

(51) International Patent Classification (IPC):  G02F 1/ 1335( . ) F21V 5/ 02( . ) G02F 1/ 13357( . ) H01J 61/ 00( . ) H01J 61/ 32( . ) F21S 2/ 00( . ) F21V 8/ 00( . ) H01J 17/ 49( . ) H01J 61/ 30( . ) H01J 61/ 33( . ) (86) International application number: PCT/GB1990/000075 (87) International publication number: WO 1990/009676 (23.08.1990 Gazette 1990/20)

(84) Designated Contracting States: DE FR GB IT NL SE (30) Priority: 11.02.1989 GB 19890003118 (71) Applicant: Smiths Industries Public Limited Company London, NW11 8DS (GB)	(72) Inventor: FOX Neil Anthony Cheltenham Gloucestershire GL54 5NA (GB) (74) Representative: Flint, Jonathan McNeill  765 Finchley Road London NW11 8DS London NW11 8DS (GB)