(19)

(11)

EP 2 539 545 A2

(12)

(43) Date of publication: 02.01.2013 Bulletin 2013/01 (21) Application number: 12739831.1 (22) Date of filing: 25.01.2012

(51) International Patent Classification (IPC):  F01D 5/22(2006.01) (86) International application number: PCT/US2012/022613 (87) International publication number: WO 2012/103262 (02.08.2012 Gazette 2012/31)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 25.01.2011 US 201113013782 (71) Applicant: Tennant Company Minneapolis, MN 55440 (US)	(72) Inventor: WYDRA, Larry, David Plymouth, MN 55441 (US) (74) Representative: Maillet, Alain  Cabinet Le Guen Maillet 5, place Newquay B.P. 70250 35802 Dinard Cedex 35802 Dinard Cedex (FR)