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EP 2 188 569 A2

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(88) Date of publication A3: 15.04.2010 (43) Date of publication: 26.05.2010 Bulletin 2010/21 (21) Application number: 08832161.7 (22) Date of filing: 17.09.2008

(51) International Patent Classification (IPC):  F23D 11/38(2006.01) F23R 3/28(2006.01) (86) International application number: PCT/US2008/076610 (87) International publication number: WO 2009/039142 (26.03.2009 Gazette 2009/13)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 17.09.2007 US 994053 P (71) Applicant: Delavan Inc. West Des Moines, IA 50265 (US)	(72) Inventors: THOMSON, Neal, A. West Des Moines IA 50265 (US) HALL, Troy Des Moines IA 50315 (US) HAGGERTY, Daniel Clive IA 50325 (US) CAPLES, Mark Ankeny IA 50023 (US) (74) Representative: Liska, Horst  Weickmann & Weickmann Patentanwälte Postfach 86 08 20 81635 München 81635 München (DE)