(19)

(11)

EP 0 455 661 A1

(12)

(43) Date of publication: 13.11.1991 Bulletin 1991/46 (21) Application number: 90901841.0 (22) Date of filing: 29.01.1990

(51) International Patent Classification (IPC):  B01J 23/ 40( . ) B01J 37/ 18( . ) B01J 35/ 10( . ) B01J 23/ 46( . ) (86) International application number: PCT/GB1990/000130 (87) International publication number: WO 1990/008592 (09.08.1990 Gazette 1990/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 30.01.1989 GB 19890001977 (71) Applicant: DAVY McKEE (LONDON) LIMITED London, W14 8YW (GB)	(72) Inventors: HARRISON, George, Edwin Essex CM12 9EE (GB) DENNIS, Alan, James Cleveland (GB) WEBB, Geoffrey Stirling FK7 0BG (GB) (74) Representative: Eyles, Christopher Thomas, et al  W.P. THOMPSON & CO. Celcon House 289-293 High Holborn London WC1V 7HU London WC1V 7HU (GB)