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EP 3 938 598 A1

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(43) Date of publication: 19.01.2022 Bulletin 2022/03 (21) Application number: 20774775.9 (22) Date of filing: 11.03.2020

(51) International Patent Classification (IPC):  E04H 4/00(2006.01) E04H 4/14(2006.01) E04H 4/12(2006.01) E04H 4/16(2006.01) (52) Cooperative Patent Classification (CPC): E04H 4/1254; E04H 4/1281 (86) International application number: PCT/US2020/000010 (87) International publication number: WO 2020/190352 (24.09.2020 Gazette 2020/39)

(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: 15.03.2019 US 201962919549 P (71) Applicant: King Technology, Inc. Hopkins, Minnesota 55343 (US)

(72) Inventors: GUY, David Maple Grove, MN 55311 (US) JOHNSON, Jeffrey, D. Edina, MN 55346 (US) FREEBERG, Paul St. Paul, MN 55305 (US) GOEMAN, Terry Minnetonka, MN 55035 (US) ENDERSON, Lyle Anoka, MN 55303 (US) SWAGEL, Darrin Minetonka, MN 55343 (US) BARTON, Eric Eden Prarie, MN 55347 (US) (74) Representative: Modiano, Gabriella Diana et al Modiano & Partners (DE) Thierschstrasse 11 80538 München 80538 München (DE)