(19)

(11)

EP 3 911 862 A1

(12)

(43) Date of publication: 24.11.2021 Bulletin 2021/47 (21) Application number: 20703515.5 (22) Date of filing: 15.01.2020

(51) International Patent Classification (IPC):  F15B 1/04(2006.01) E21B 33/035(2006.01) F15B 21/00(2006.01) (52) Cooperative Patent Classification (CPC): F15B 2201/32; E21B 33/0355; F15B 21/006; F15B 1/04; F15B 2201/31; F15B 2211/40 (86) International application number: PCT/IB2020/050297 (87) International publication number: WO 2020/148667 (23.07.2020 Gazette 2020/30)

(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: 15.01.2019 NO 20190053 (71) Applicant: OBS Technology AS 3132 Husøysund (NO)	(72) Inventor: OTTESTAD, Nils, Terje 3118 Tønsberg (NO) (74) Representative: Onsagers AS  P.O. Box 1813 Vika 0123 Oslo 0123 Oslo (NO)