(19)

(11)

EP 3 472 389 A1

(12)

(43) Date of publication: 24.04.2019 Bulletin 2019/17 (21) Application number: 17812365.9 (22) Date of filing: 16.06.2017

(51) International Patent Classification (IPC):  E01C 19/23(2006.01) E01C 19/29(2006.01) E01C 19/26(2006.01) (86) International application number: PCT/CA2017/050741 (87) International publication number: WO 2017/214733 (21.12.2017 Gazette 2017/51)

(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 Designated Validation States: MA MD (30) Priority: 16.06.2016 US 201662351032 P (71) Applicant: R.W. Tomlinson Limited Ottawa, Ontario K1G 3N4 (CA)	(72) Inventors: PERRY, Russ Ottawa, Ontario K1G 3N4 (CA) HALIM, A. O. Abd El Ottawa, Ontario K1S 5B6 (CA) ALLEN, Stewart Ottawa, Ontario K1G 3N4 (CA) (74) Representative: Dummett Copp LLP  25 The Square Martlesham Heath Ipswich IP5 3SL Ipswich IP5 3SL (GB)