(19)

(11)

EP 1 934 482 A2

(12)

(43) Date of publication: 25.06.2008 Bulletin 2008/26 (21) Application number: 06815874.0 (22) Date of filing: 28.09.2006

(51) International Patent Classification (IPC):  F04D 29/04(2006.01) (86) International application number: PCT/US2006/038197 (87) International publication number: WO 2007/044260 (19.04.2007 Gazette 2007/16)

(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 Designated Extension States: AL BA HR MK RS (30) Priority: 06.10.2005 US 244744 (71) Applicant: Edwards Vacuum, Inc. Wilmington, MA 01887 (US)	(72) Inventor: HUNTLEY, Graeme Somerset XX TA6 7PH (GB) (74) Representative: Clark, Charles Robert  Edwards Limited Manor Royal Crawley, West Sussex RH10 9LW Crawley, West Sussex RH10 9LW (GB)