(19)

(11)

EP 0 238 607 A1

(12)

(43) Date of publication: 30.09.1987 Bulletin 1987/40 (21) Application number: 86905891.0 (22) Date of filing: 01.10.1986

(51) International Patent Classification (IPC):  B01D 39/ 20( . ) C04B 38/ 06( . ) C04B 35/ 565( . ) C22B 21/ 06( . ) (86) International application number: PCT/GB1986/000588 (87) International publication number: WO 1987/002069 (09.04.1987 Gazette 1987/08)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 03.10.1985 GB 19850024400 (71) Applicant: FOSECO INTERNATIONAL LIMITED Nechells Birmingham B7 5JR (GB)	(72) Inventor: CHILD, Nicholas, Ronald 6 Oxford House Wolverhampton Road Warley, West Midlands (GB)