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(11)

EP 3 935 613 A1

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(43) Date of publication: 12.01.2022 Bulletin 2022/02 (21) Application number: 19712392.0 (22) Date of filing: 06.03.2019

(51) International Patent Classification (IPC):  G08B 27/00(2006.01) G08B 5/00(2006.01) G08B 25/08(2006.01) G08G 1/0965(2006.01) (52) Cooperative Patent Classification (CPC): G08B 5/006; G08B 27/001; G08B 25/08; G08G 1/0965 (86) International application number: PCT/US2019/020915 (87) International publication number: WO 2020/180310 (10.09.2020 Gazette 2020/37)

(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 (71) Applicant: Whelen Engineering Company, Inc. Chester, CT 06412 (US)	(72) Inventors: WHELEN, George Old Saybrook, CT 06475 (US) LEMIEUX, Kenneth Groton, CT 06340 (US) (74) Representative: Prinz & Partner mbB  Patent- und Rechtsanwälte Rundfunkplatz 2 80335 München 80335 München (DE)