(19)

(11)

EP 2 577 020 A1

(12)

(43) Date of publication: 10.04.2013 Bulletin 2013/15 (21) Application number: 10852289.7 (22) Date of filing: 28.05.2010

(51) International Patent Classification (IPC):  F02B 75/00(2006.01) (86) International application number: PCT/US2010/001581 (87) International publication number: WO 2011/149444 (01.12.2011 Gazette 2011/48)

(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 SE SI SK SM TR (71) Applicants: Hansen, Craig N. Plymouth, MN 55441 (US) Cross, Paul C. Shorewood, MN 55331 (US)	(72) Inventors: Hansen, Craig N. Plymouth, MN 55441 (US) Cross, Paul C. Shorewood, MN 55331 (US) (74) Representative: Dennemeyer & Associates S.A.  55, rue des Bruyères 1274 Howald 1274 Howald (LU)