(19)

(11)

EP 1 268 027 A1

(12)

(43) Date of publication: 02.01.2003 Bulletin 2003/01 (21) Application number: 01907149.7 (22) Date of filing: 09.02.2001

(51) International Patent Classification (IPC)7: B01D 21/00, B03D 1/00, B01D 21/01, B01D 21/08, B03D 3/00, C02F 1/52 (86) International application number: PCT/US0104/139 (87) International publication number: WO 0106/0494 (23.08.2001 Gazette 2001/34)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 18.02.2000 US 506781 (71) Applicant: THE F.B. LEOPOLD COMPANY, INC. Zelienople,Pennsylvania 16063-1313 (US)	(72) Inventors: EADES, Andrew Pittsburg, PA 15237 (US) PENNO, Jeffrey Pittsburgh, PA 15214 (US) (74) Representative: Van den Heuvel, Henricus Theodorus  Patentwerk BVP.O. Box 1514 5200 BN 's-Hertogenbosch 5200 BN 's-Hertogenbosch (NL)