(19)

(11)

EP 4 739 875 A1

(12)

(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 23742473.4 (22) Date of filing: 06.07.2023

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) E21B 44/00(2006.01) E21B 21/16(2006.01) E21F 5/02(2006.01) (52) Cooperative Patent Classification (CPC): E21B 21/16; E21B 7/02; E21B 44/00; E21B 7/025; E21F 5/02 (86) International application number: PCT/SE2023/050714 (87) International publication number: WO 2025/009996 (09.01.2025 Gazette 2025/02)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (71) Applicant: Epiroc Rock Drills Aktiebolag 701 91 Örebro (SE)	(72) Inventor: MÖRTZELL, Gustav 701 91 Örebro (SE) (74) Representative: Epiroc Rock Drills AB  Patents 701 91 Örebro 701 91 Örebro (SE)