(19)

(11)

EP 0 912 224 A1

(12)

(43) Date of publication: 06.05.1999 Bulletin 1999/18 (21) Application number: 97900859.0 (22) Date of filing: 03.01.1997

(51) International Patent Classification (IPC):  B01D 27/ 08( . ) B01D 35/ 30( . ) (86) International application number: PCT/US1997/000027 (87) International publication number: WO 1997/040911 (06.11.1997 Gazette 1997/47)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 02.05.1996 US 19960016724P (71) Applicant: Alco Industries, Inc. Valley Forge, PA 19482 (US)	(72) Inventors: VIJLEE, Abbas, F. McKees Rocks, PA 15136 (US) RUDZIK, Mark, E. Coraopolis, PA 15108 (US) (74) Representative: Land, Addick Adrianus Gosling  Arnold & Siedsma, Advocaten en Octrooigemachtigden, Sweelinckplein 1 2517 GK Den Haag 2517 GK Den Haag (NL)