(19)

(11)

EP 2 580 482 A2

(12)

(88) Date of publication A3: 05.04.2012 (43) Date of publication: 17.04.2013 Bulletin 2013/16 (21) Application number: 11793032.1 (22) Date of filing: 07.06.2011

(51) International Patent Classification (IPC):  F15B 1/26(2006.01) F04B 23/02(2006.01) (86) International application number: PCT/US2011/039464 (87) International publication number: WO 2011/156390 (15.12.2011 Gazette 2011/50)

(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: 06.06.2011 US 201113153575 09.06.2010 US 352859 P (71) Applicant: Helgesen Design Services, LLC Hartford, Wisconsin 53027 (US)	(72) Inventor: KNUTH, Bruce E. Oconomowoc Wisconsin 53066 (US) (74) Representative: Lawrence, John  Barker Brettell LLP 100 Hagley Road Edgbaston Birmingham B16 8QQ Edgbaston Birmingham B16 8QQ (GB)