(19)

(11)

EP 0 237 568 A1

(12)

(43) Date of publication: 23.09.1987 Bulletin 1987/39 (21) Application number: 86906208.0 (22) Date of filing: 03.10.1986

(51) International Patent Classification (IPC):  B01D 53/ 56( . ) (86) International application number: PCT/US1986/002090 (87) International publication number: WO 1987/002023 (09.04.1987 Gazette 1987/08)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 04.10.1985 US 19850784827 20.12.1985 US 19850811532 10.09.1986 US 19860906671 (71) Applicant: FUEL TECH, INC. Stamford, CT 06906 (US)	(72) Inventor: BOWERS, Wayne, E. Clearwater, FL 33575 (US) (74) Representative: Lambert, Hugh Richmond  D. YOUNG & CO., 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)