(19)

(11)

EP 3 841 256 A1

(12)

(43) Date of publication: 30.06.2021 Bulletin 2021/26 (21) Application number: 19782663.9 (22) Date of filing: 19.08.2019

(51) International Patent Classification (IPC):  E03B 1/04(2006.01) E03F 5/10(2006.01) E03B 3/03(2006.01) (86) International application number: PCT/GB2019/052319 (87) International publication number: WO 2020/039172 (27.02.2020 Gazette 2020/09)

(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: 20.08.2018 GB 201813517 (71) Applicant: Hydrocells Ltd Darlington, County Durham DL3 7EH (GB)	(72) Inventor: TURNER, Andrew Durham DL5 6PQ (GB) (74) Representative: Archer, Graham John  Archer-IP Ltd Northern Design Centre Abbott's Hill Gateshead Newcastle upon Tyne NE8 3DF Newcastle upon Tyne NE8 3DF (GB)