(19)

(11)

EP 0 621 984 A1

(12)

(43) Date of publication: 02.11.1994 Bulletin 1994/44 (21) Application number: 93901857.0 (22) Date of filing: 13.01.1993

(51) International Patent Classification (IPC):  H01B 13/ 00( . ) C04B 35/ 00( . ) H01L 39/ 24( . ) B21J 9/ 02( . ) H01B 12/ 00( . ) (86) International application number: PCT/GB1993/000063 (87) International publication number: WO 1993/014526 (22.07.1993 Gazette 1993/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 15.01.1992 GB 19920000790 (71) Applicants: BICC Public Limited Company London W1X 5FH (GB) PENNY & GILES BLACKWOOD LIMITED Gwent NP2 2YD (GB)

(72) Inventors: BEALES, Timothy Paul Bar Hill, Cambridge CB3 8TE (GB) ASHRAF, Mufti Mohmed Hengoed, Mid Glamorgan CF8 7NH (GB) TEDSTONE, Sean Francis Newbridge, Gwent NP1 4NF (GB) MARSHALL, Steven Nr Treharris, Mid Glamorgan CF46 6EL (GB) (74) Representative: Poole, Michael John  BICC plc Patents and Licensing Department Quantum House Maylands Avenue Hemel Hempstead, Herts. HP2 4SJ Hemel Hempstead, Herts. HP2 4SJ (GB)