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EP 3 759 255 A1

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(43) Date of publication: 06.01.2021 Bulletin 2021/01 (21) Application number: 19841627.3 (22) Date of filing: 24.06.2019

(51) International Patent Classification (IPC):  C21B 7/10(2006.01) F27D 1/12(2006.01) F27B 1/24(2006.01) (86) International application number: PCT/US2019/038752 (87) International publication number: WO 2020/023169 (30.01.2020 Gazette 2020/05)

(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: 22.07.2018 US 201862701832 P 11.08.2018 US 201816101418 22.02.2019 US 201962808857 P 03.03.2019 US 201916290922 24.05.2019 US 201916422909 (71) Applicant: MACRAE TECHNOLOGIES, INC. Lane Hayward, CA 94544 (US)

(72) Inventor: MACRAE, Allan Hayward, CA 94544 (US) (74) Representative: Bosma, Marten Jan  Arnold & Siedsma Bezuidenhoutseweg 57 2594 AC Den Haag 2594 AC Den Haag (NL)