(19)

(11)

EP 3 997 301 A1

(12)

(43) Date of publication: 18.05.2022 Bulletin 2022/20 (21) Application number: 19821227.6 (22) Date of filing: 16.10.2019

(51) International Patent Classification (IPC):  E21B 19/14(2006.01) (52) Cooperative Patent Classification (CPC): E21B 19/14 (86) International application number: PCT/RO2019/000026 (87) International publication number: WO 2021/075990 (22.04.2021 Gazette 2021/16)

(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 (71) Applicant: PAX ELEVANS S.R.L. 020243 Bucharest (RO)	(72) Inventor: BLASIUS, Robert Gabriel 020243 Bucharest (RO) (74) Representative: Petcu, Costin  Rominvent S.A. Patents 35, Ermil Pangratti Str. 1st Floor Sector 1 011882 Bucuresti 011882 Bucuresti (RO)