(19)

(11)

EP 3 774 097 A1

(12)

(43) Date of publication: 17.02.2021 Bulletin 2021/07 (21) Application number: 19781307.4 (22) Date of filing: 01.04.2019

(51) International Patent Classification (IPC):  B09C 1/00(2006.01) E21C 41/32(2006.01) (86) International application number: PCT/RU2019/000207 (87) International publication number: WO 2019/194706 (10.10.2019 Gazette 2019/41)

(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: KH MA MD TN (30) Priority: 03.04.2018 RU 2018111794 (71) Applicant: Serdyuk Mikhail Ivanovich Surgut, 628418 (RU)	(72) Inventor: Serdyuk Mikhail Ivanovich Surgut, 628418 (RU) (74) Representative: Jeck, Anton  Jeck, Fleck & Partner mbB Patentanwälte Klingengasse 2 71665 Vaihingen/Enz 71665 Vaihingen/Enz (DE)