(19)

(11)

EP 4 401 848 A2

(12)

(88) Date of publication A3: 08.06.2023 (43) Date of publication: 24.07.2024 Bulletin 2024/30 (21) Application number: 22870971.3 (22) Date of filing: 16.09.2022

(51) International Patent Classification (IPC):  A63B 47/00(2006.01) B05D 5/02(2006.01) B05D 3/12(2006.01) A63B 37/00(2006.01) (52) Cooperative Patent Classification (CPC): B05D 1/22; A63B 45/00; B05D 2203/24; B05D 2401/32; B05D 2518/10; B05D 2601/22; B05D 2258/02; A63B 47/008; A63B 2102/18 (86) International application number: PCT/US2022/076538 (87) International publication number: WO 2023/044415 (23.03.2023 Gazette 2023/12)

(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 (30) Priority: 17.09.2021 US 202163245742 P 05.10.2021 US 202163262117 P 18.10.2021 US 202163262654 P 03.11.2021 US 202163263484 P 30.11.2021 US 202163264674 P 01.07.2022 US 202217810356 01.07.2022 WO PCT/US2022/073334 (71) Applicant: Chalkless, Inc. Wilmington, MA 01887 (US)

(72) Inventors: POPE, David, G. Wilmington, MA 01887 (US) PIDHURNEY, James, M. Wilmington, MA 01887 (US) (74) Representative: Murgitroyd & Company  165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)