(19)

(11)

EP 0 139 639 A1

(12)

(43) Date of publication: 08.05.1985 Bulletin 1985/19 (21) Application number: 83901497.0 (22) Date of filing: 16.03.1983

(51) International Patent Classification (IPC):  B01D 27/ 08( . ) B01D 35/ 30( . ) B01D 46/ 24( . ) B01D 29/ 11( . ) B01D 46/ 00( . ) (86) International application number: PCT/US1983/000401 (87) International publication number: WO 1984/004050 (25.10.1984 Gazette 1984/25)

(84) Designated Contracting States: DE FR GB (71) Applicant: WHATMAN REEVE ANGEL PLC Maidstone Kent ME14 2LE (GB)	(72) Inventor: PERROTTA, Kenneth, A. Salem, NH 03079 (US) (74) Representative: Williams, Trevor John, et al  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5EU London WC1R 5EU (GB)