(19)

(11)

EP 0 939 678 A1

(12)

(43) Date of publication: 08.09.1999 Bulletin 1999/36 (21) Application number: 96938312.0 (22) Date of filing: 13.11.1996

(51) International Patent Classification (IPC):  B07B 1/ 15( . ) B07B 13/ 04( . ) (86) International application number: PCT/GB1996/002754 (87) International publication number: WO 1998/020986 (22.05.1998 Gazette 1998/20)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: BRITISH TECHNOLOGY GROUP INTER-CORPORATE LICENSING LIMITED London SE1 6BU (GB)	(72) Inventor: CADDICK, David, Albert Kippax, Leeds LS25 7PB (GB) (74) Representative: Simpson, Paul Christopher  BTG International Ltd 10 Fleet Place Limeburner Lane London EC4M 7SB London EC4M 7SB (GB)