(19)

(11)

EP 4 051 847 A1

(12)

(43) Date of publication: 07.09.2022 Bulletin 2022/36 (21) Application number: 19801743.6 (22) Date of filing: 30.10.2019

(51) International Patent Classification (IPC):  E04B 5/48(2006.01) F24D 3/14(2006.01) E04C 5/20(2006.01) (52) Cooperative Patent Classification (CPC): E04B 5/48; E04C 5/205; F24D 3/142; Y02B 30/00; F24D 3/144 (86) International application number: PCT/EP2019/079754 (87) International publication number: WO 2021/052608 (25.03.2021 Gazette 2021/12)

(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 (71) Applicant: De Haas Holding Hoofddorp B.V. 2132 CC Hoofddorp (NL)	(72) Inventor: DE HAAS, Ernst 2132 KV Hoofddorp (NL) (74) Representative: Plaggenborg, Menko Bernard  Octrooibureau Novopatent Transistorstraat 31, Office 02-18 1322 CK Almere 1322 CK Almere (NL)