(19)

(11)

EP 0 927 084 A1

(12)

(43) Date of publication: 07.07.1999 Bulletin 1999/27 (21) Application number: 97919170.0 (22) Date of filing: 19.09.1997

(51) International Patent Classification (IPC):  A61L 11/ 00( . ) C02F 11/ 08( . ) B09B 3/ 00( . ) G21F 9/ 30( . ) (86) International application number: PCT/GB1997/002535 (87) International publication number: WO 1998/012003 (26.03.1998 Gazette 1998/12)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 19.09.1996 GB 19960019523 (71) Applicant: The BOC Group plc Windlesham Surrey GU20 6HJ (GB)	(72) Inventor: FERGUSON, Ian, Geoffrey Bucks HP19 3SH (GB) (74) Representative: Bousfield, Roger James, et al  The BOC Group plc Chertsey Road Windlesham Surrey GU20 6HJ Windlesham Surrey GU20 6HJ (GB)