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(11)

EP 1 487 562 A1

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(43) Date of publication: 22.12.2004 Bulletin 2004/52 (21) Application number: 02717532.2 (22) Date of filing: 01.03.2002

(51) International Patent Classification (IPC)7: B01D 50/00, B01D 45/12, B01D 39/06, B01D 35/30 (86) International application number: PCT/US2002/006453 (87) International publication number: WO 2003/084643 (16.10.2003 Gazette 2003/42)

(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 (71) Applicant: Greenheck Fan Corporation Schofield, WI 54476 (US)	(72) Inventors: BROWNELL, Kyle, A. Schofield, WI 54476 (US) MATHEWS, Scott, W. Mosinee, WI 54455 (US) BREITENFELDT, Alan, Lorenz Wausau, WI 54403 (US) NEITZEL, Emery, W. Rothschild, WI 54474 (US) (74) Representative: James, Michael John Gwynne  Wynne-Jones, Lainé & James22, Rodney Road CheltenhamGloucestershire GL50 1JJ CheltenhamGloucestershire GL50 1JJ (GB)