(19)

(11)

EP 1 922 488 A2

(12)

(88) Date of publication A3: 10.05.2007 (43) Date of publication: 21.05.2008 Bulletin 2008/21 (21) Application number: 06813316.4 (22) Date of filing: 08.08.2006

(51) International Patent Classification (IPC):  F04D 29/04(2006.01) (86) International application number: PCT/US2006/030778 (87) International publication number: WO 2007/021656 (22.02.2007 Gazette 2007/08)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 10.08.2005 US 707088 P 07.08.2006 US 500123 (71) Applicant: Envirotech Pumpsystems, Inc. Salt Lake City, UT 84110-0209 (US)	(72) Inventor: PAULIN, Greg Alpine, UT 84004 (US) (74) Representative: Vleck, Jan Montagu  Reddie & Grose, 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)