(19)

(11)

EP 0 331 707 A1

(12)

(43) Date of publication: 13.09.1989 Bulletin 1989/37 (21) Application number: 88908290.0 (22) Date of filing: 22.09.1988

(51) International Patent Classification (IPC):  C21C 5/ 46( . ) F27B 3/ 24( . ) C21C 7/ 00( . ) C21C 7/ 10( . ) F27D 9/ 00( . ) (86) International application number: PCT/GB1988/000780 (87) International publication number: WO 1989/003011 (06.04.1989 Gazette 1989/08)

(84) Designated Contracting States: AT BE DE FR GB IT NL SE (30) Priority: 23.09.1987 GB 19870022354 (71) Applicant: DAVY MCKEE (STOCKTON) LIMITED Stockton-on-Tees Cleveland TS18 3RE (GB)	(72) Inventor: MACAULEY, Derek Nr. Darlington Country Durham (GB) (74) Representative: Kirk, Geoffrey Thomas, et al  BATCHELLOR, KIRK & CO. 2 Pear Tree Court Farringdon Road London EC1R 0DS London EC1R 0DS (GB)