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EP 3 022 440 A1

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(43) Date of publication: 25.05.2016 Bulletin 2016/21 (21) Application number: 14826286.8 (22) Date of filing: 02.07.2014

(51) International Patent Classification (IPC):  F04B 9/02(2006.01) E21B 43/16(2006.01) F04B 35/04(2006.01) (86) International application number: PCT/US2014/045233 (87) International publication number: WO 2015/009452 (22.01.2015 Gazette 2015/03)

(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 Designated Extension States: BA ME (30) Priority: 17.07.2013 US 201313943933 (71) Applicant: Unico, Inc. Franskville, WI 53126-0505 (US)	(72) Inventors: GREGORY, Benjamin, J. Racine, WI 53405 (US) BECK, Thomas, L. Union Grove, WI 53182 (US) PETERSON, Ronald, G. Racine, WI 53405 (US) MacDONALD, Michael, A. Racine, WI 53402 (US) DRY, Michael, D. Racine, WI 53402 (US) (74) Representative: Ashton, Gareth Mark et al Baron Warren Redfern Cambridge House 100 Cambridge Grove Hammersmith London W6 0LE London W6 0LE (GB)