(19)

(11)

EP 3 931 508 A1

(12)

(43) Date of publication: 05.01.2022 Bulletin 2022/01 (21) Application number: 20712443.9 (22) Date of filing: 28.02.2020

(51) International Patent Classification (IPC):  F28D 7/04(2006.01) F28F 9/02(2006.01) F28D 7/00(2006.01) F28F 27/00(2006.01) (52) Cooperative Patent Classification (CPC): F28D 7/0066; F28D 7/04; F28D 7/0083; F28F 27/00; F28F 9/0243 (86) International application number: PCT/EP2020/055355 (87) International publication number: WO 2020/178199 (10.09.2020 Gazette 2020/37)

(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: 01.03.2019 GB 201902802 (71) Applicant: Reaction Engines Limited Abington, Oxfordshire OX14 3DB (GB)	(72) Inventors: BURVILL, Thomas Charles Abingdon OX14 3DB (GB) NICHOL, Hamish Alexander Abingdon OX14 3DB (GB) (74) Representative: Lloyd, Robin Jonathan et al Kilburn & Strode LLP Lacon London 84 Theobalds Road London WC1X 8NL London WC1X 8NL (GB)