(19)

(11)

EP 4 444 989 A1

(12)

(43) Date of publication: 16.10.2024 Bulletin 2024/42 (21) Application number: 22839604.0 (22) Date of filing: 18.11.2022

(51) International Patent Classification (IPC):  E21B 47/07(2012.01) F42B 3/00(2006.01) F42D 1/08(2006.01) F42C 11/06(2006.01) (52) Cooperative Patent Classification (CPC): E21B 47/07; E21B 43/116; F42D 1/08; F42B 3/00; F42C 11/06 (86) International application number: PCT/ZA2022/050058 (87) International publication number: WO 2023/108179 (15.06.2023 Gazette 2023/24)

(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 (30) Priority: 07.12.2021 ZA 202110056 (71) Applicant: Detnet South Africa (Pty) Ltd 2191 Johannesburg (ZA)	(72) Inventors: KRUGER, Michiel Jacobus 2191 Johannesburg (ZA) VAN SOELEN, Schagen Diederik Wellington Point, Queensland 4160 (AU) LO, Cory Simsbury, Connecticut 06070 (US) (74) Representative: Patentanwälte Ruff, Wilhelm, Beier, Dauster & Partner mbB  Kronenstraße 30 70174 Stuttgart 70174 Stuttgart (DE)