(19)

(11)

EP 2 368 040 A2

(12)

(88) Date of publication A3: 23.09.2010 (43) Date of publication: 28.09.2011 Bulletin 2011/39 (21) Application number: 09837995.1 (22) Date of filing: 18.12.2009

(51) International Patent Classification (IPC):  F04B 39/12(2006.01) F04B 35/01(2006.01) (86) International application number: PCT/US2009/068773 (87) International publication number: WO 2010/080625 (15.07.2010 Gazette 2010/28)

(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 MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 18.12.2008 US 138776 P (71) Applicant: Weir Spm, Inc. Fort Worth, TX 76108 (US)	(72) Inventors: HAWES, John, E. Southlake TX 76092 (US) MATZNER, Mark, D. Burleson TX 76028 (US) (74) Representative: Dauncey, Mark Peter et al Marks & Clerk LLP 1 New York Street Manchester, M1 4HD Manchester, M1 4HD (GB)