(19)

(11)

EP 0 672 026 A1

(12)

(43) Date of publication: 20.09.1995 Bulletin 1995/38 (21) Application number: 94927736.0 (22) Date of filing: 28.09.1994

(51) International Patent Classification (IPC):  C03C 8/ 16( . ) C04B 41/ 52( . ) C03C 8/ 18( . ) C04B 41/ 89( . ) (86) International application number: PCT/GB1994/002109 (87) International publication number: WO 1995/009823 (13.04.1995 Gazette 1995/16)

(84) Designated Contracting States: DE ES GB PT (30) Priority: 02.10.1993 GB 19930020370 (71) Applicant: COOKSON MATTHEY CERAMICS PLC London WC2V 6EQ (GB)	(72) Inventors: FISHER, Robert, Paul Melbourn, Royston SG8 6DB (GB) GREAVES, Peter, Sydney Ashbank, Stoke on Trent ST2 9QH (GB) (74) Representative: Brewer, Leonard Stuart  Patents Department Johnson Matthey Technology Centre Blounts Court Sonning Common Reading Berkshire RG4 9NH Reading Berkshire RG4 9NH (GB)