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(11)

EP 3 743 317 A1

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(43) Date of publication: 02.12.2020 Bulletin 2020/49 (21) Application number: 19704929.9 (22) Date of filing: 23.01.2019

(51) International Patent Classification (IPC):  B60S 1/52(2006.01) B05B 1/04(2006.01) B05B 1/14(2006.01) B08B 3/02(2006.01) (86) International application number: PCT/US2019/014746 (87) International publication number: WO 2019/147668 (01.08.2019 Gazette 2019/31)

(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: 23.01.2018 US 201862620826 P 12.03.2018 US 201815759242 (71) Applicant: DLHBowles, Inc. Canton, Ohio 44706 (US)	(72) Inventor: ZHAO, Chunling Ellicott City, Maryland 21042 (US) (74) Representative: Müller-Boré & Partner Patentanwälte PartG mbB  Friedenheimer Brücke 21 80639 München 80639 München (DE)