(19)

(11)

EP 4 453 992 A1

(12)

(43) Date of publication: 30.10.2024 Bulletin 2024/44 (21) Application number: 22912431.8 (22) Date of filing: 21.12.2022

(51) International Patent Classification (IPC):  H01J 45/00(2006.01) F24D 101/60(2022.01) F24V 30/00(2018.01) (52) Cooperative Patent Classification (CPC): H01J 45/00 (86) International application number: PCT/US2022/053662 (87) International publication number: WO 2023/122177 (29.06.2023 Gazette 2023/26)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 21.12.2021 US 202163292263 P (71) Applicant: Spark Thermionics, Inc. Berkeley, CA 94710 (US)	(72) Inventors: SCHMITT, Felix Berkeley, California 94710 (US) SCHWEDE, Jared William Berkeley, California 94710 (US) RICH, David Berkeley, California 94710 (US) SANDBERG, Tyler Berkeley, California 94710 (US) (74) Representative: Murgitroyd & Company  165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)