(19)
(11) EP 4 823 709 A1

(12)

(43) Date of publication:
21.10.2026 Bulletin 2026/43

(21) Application number: 24905053.5

(22) Date of filing: 14.12.2024
(51) International Patent Classification (IPC): 
B01D 46/44(2006.01)
B01D 35/143(2006.01)
G01N 15/06(2024.01)
 B01D 27/10(2006.01)
F24F 11/39(2018.01)
(52) Cooperative Patent Classification (CPC):
B01D 2279/50; F24F 8/108; B01D 46/0086; B01D 46/0005; F24F 11/39
(86) International application number:
PCT/US2024/060254
(87) International publication number:
WO 2025/129150 (19.06.2025 Gazette 2025/25)
(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:
GE KH MA MD TN

(30) Priority: 14.12.2023 US 202363610029 P
13.12.2024 US 202418981355

(71) Applicant: K & N Engineering, Inc.
Riverside, CA 92507 (US)

(72) Inventors:
  • WILLIAMS, Steve
    Riverside, CA 92507 (US)
  • ADRIAANS, Joost
    Riverside, CA 92507 (US)

(74) Representative: Gevers Patents 
De Kleetlaan 7A
1831 Diegem
1831 Diegem (BE)

   


(54) AIR FILTER SYSTEM FOR DETECTING DIFFERENTIAL ELECTRICAL PROPERTIES TO INDICATE A NEED FOR SERVICING