(19)

(11)

EP 4 025 927 A2

(12)

(88) Date of publication A3: 15.04.2021 (43) Date of publication: 13.07.2022 Bulletin 2022/28 (21) Application number: 20860109.6 (22) Date of filing: 04.09.2020

(51) International Patent Classification (IPC):  G01R 33/02(2006.01) G01R 33/06(2006.01) G01R 33/09(2006.01) G06K 7/08(2006.01) (52) Cooperative Patent Classification (CPC): H04L 9/3278; H04L 9/0866; G01R 33/0094; G01R 33/0082; G01R 33/1276; G01R 33/0206; G01R 33/072 (86) International application number: PCT/US2020/049407 (87) International publication number: WO 2021/046351 (11.03.2021 Gazette 2021/10)

(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: 06.09.2019 US 201962896883 P 02.12.2019 US 201962942364 P (71) Applicant: Lexmark International, Inc. Lexington, KY 40550 (US)	(72) Inventors: ELLIS, James, Howard, Jr. Lexington, KY 40515 (US) HARDIN, Keith, Bryan Lexington, KY 40513 (US) (74) Representative: Cameron Intellectual Property Ltd  Moncrieff House 69 West Nile Street Glasgow G1 2QB Glasgow G1 2QB (GB)