(19)

(11)

EP 4 363 791 A1

(12)

(43) Date of publication: 08.05.2024 Bulletin 2024/19 (21) Application number: 22740524.8 (22) Date of filing: 28.06.2022

(51) International Patent Classification (IPC):  F42B 12/22(2006.01) F42B 12/76(2006.01) F42C 19/00(2006.01) (52) Cooperative Patent Classification (CPC): F42B 12/208; F42B 12/76; F42B 12/22; F42C 19/00; F42C 19/0842 (86) International application number: PCT/IB2022/055974 (87) International publication number: WO 2023/275728 (05.01.2023 Gazette 2023/01)

(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: 28.06.2021 GB 202109254 (71) Applicant: The Secretary of State for Defence Salisbury, Wiltshire SP4 0JQ (GB)	(72) Inventor: GRIFFITHS, O Salisbury Wiltshire SP4 0JQ (GB) (74) Representative: Phillips, Thomas Edward  Ministry of Defence Defence Intellectual Property Rights Poplar 2 No. 2214 MoD Abbey Wood (South) Bristol BS34 8JH Bristol BS34 8JH (GB)