(19)

(11)

EP 4 499 939 A1

(12)

(43) Date of publication: 05.02.2025 Bulletin 2025/06 (21) Application number: 23718877.6 (22) Date of filing: 27.03.2023

(51) International Patent Classification (IPC):  E04D 1/12(2006.01) E04D 1/20(2006.01) E04D 1/34(2006.01) E04D 1/14(2006.01) E04D 12/00(2006.01) (52) Cooperative Patent Classification (CPC): E04D 1/12; E04D 1/14; E04D 1/20; E04D 2001/3429; E04D 12/002; E04D 2001/3447; E04D 2001/3455; E04D 2001/3473; E04D 1/34 (86) International application number: PCT/US2023/016365 (87) International publication number: WO 2023/192150 (05.10.2023 Gazette 2023/40)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 30.03.2022 US 202217708191 (71) Applicant: Millennium Slate, LLC Middle Granville, NY 12849 (US)	(72) Inventors: WHITRIDGE, Frederick W. NY 12581 (US) PREHODA, Philip C. NY 12849 (US) COLLARD, Thomas J. West Pawlet, VT 05775 (US) WARD, Charles West Rupert, VT 05776 (US) (74) Representative: Dummett Copp LLP  25 The Square Martlesham Heath Ipswich IP5 3SL Ipswich IP5 3SL (GB)