(19)

(11)

EP 4 097 297 A1

(12)

(43) Date of publication: 07.12.2022 Bulletin 2022/49 (21) Application number: 21746315.7 (22) Date of filing: 28.01.2021

(51) International Patent Classification (IPC):  D21H 11/18(2006.01) D21C 1/06(2006.01) D21C 3/02(2006.01) D21C 9/00(2006.01) (52) Cooperative Patent Classification (CPC): D21H 11/18; D21C 9/00; D21H 11/20; D21C 9/004 (86) International application number: PCT/AU2021/050050 (87) International publication number: WO 2021/151149 (05.08.2021 Gazette 2021/31)

(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: 31.01.2020 AU 2020900276 29.06.2020 AU 2020902179 01.12.2020 AU 2020904449 (71) Applicant: Cass Materials Pty Ltd Perth WA 6000 (AU)	(72) Inventor: CASS, Gary Perth, Western Australia 6000 (AU) (74) Representative: Abthorpe, Mark et al Kilburn & Strode LLP Lacon London 84 Theobalds Road London WC1X 8NL London WC1X 8NL (GB)