(19)

(11)

EP 4 208 672 A1

(12)

(43) Date of publication: 12.07.2023 Bulletin 2023/28 (21) Application number: 21863788.2 (22) Date of filing: 23.08.2021

(51) International Patent Classification (IPC):  F22B 29/06(2006.01) F22B 15/00(2006.01) F22B 29/02(2006.01) F22B 21/00(2006.01) (52) Cooperative Patent Classification (CPC): F22B 29/02; F22B 29/06; F22B 13/04; F22B 21/007; F22B 1/1869; F22B 13/08 (86) International application number: PCT/IB2021/057697 (87) International publication number: WO 2022/049447 (10.03.2022 Gazette 2022/10)

(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: 02.09.2020 NZ 20767635 (71) Applicant: Mackwell Pero & Co Limited Christchurch, 8042 (NZ)	(72) Inventor: MACKWELL, Samuel James Christchurch, 7671 (NZ) (74) Representative: van Breda, Jacobus  Octrooibureau Los & Stigter B.V. Weteringschans 96 1017 XS Amsterdam 1017 XS Amsterdam (NL)