(19)

(11)

EP 3 935 625 A1

(12)

(43) Date of publication: 12.01.2022 Bulletin 2022/02 (21) Application number: 19713258.2 (22) Date of filing: 07.03.2019

(51) International Patent Classification (IPC):  G10K 11/178(2006.01) (52) Cooperative Patent Classification (CPC): G10K 2210/3055; G10K 2210/1282; G10K 11/17813; G10K 11/17873; G10K 11/17853 (86) International application number: PCT/US2019/021124 (87) International publication number: WO 2020/180326 (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: CONLON, Brandon Bristol, CT 06010 (US) DORNFELD, David Killingworth, CT 06419 (US) (74) Representative: Prinz & Partner mbB  Patent- und Rechtsanwälte Rundfunkplatz 2 80335 München 80335 München (DE)