(19)
(11) EP 4 387 753 A1

(12)

(43) Date of publication:
26.06.2024 Bulletin 2024/26

(21) Application number: 22765614.7

(22) Date of filing: 16.08.2022
(51) International Patent Classification (IPC): 
B01D 29/11(2006.01)
B01D 29/68(2006.01)
B01D 35/147(2006.01)
B01D 37/04(2006.01)
 B01D 29/52(2006.01)
B01D 35/00(2006.01)
B01D 35/157(2006.01)
(52) Cooperative Patent Classification (CPC):
B01D 29/114; B01D 29/682; B01D 29/52; B01D 35/005; B01D 35/147; B01D 35/157; B01D 35/1573; B01D 37/04
(86) International application number:
PCT/IB2022/057668
(87) International publication number:
WO 2023/021422 (23.02.2023 Gazette 2023/08)
(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: 17.08.2021 DE 202021104399 U

(71) Applicant: Boll & Kirch Filterbau Gesellschaft mit beschränkter Haftung
50170 Kerpen (DE)

(72) Inventors:
  • CARTARIUS, Karsten
    52391 Vettweiß (DE)
  • FINSEL, Andreas
    50858 Köln (DE)

(74) Representative: Patentanwälte Buschhoff Hennicke Althaus 
Kaiser-Wilhelm-Ring 24
50672 Köln
50672 Köln (DE)

   


(54) FILTERING DEVICE WITH A MAIN FILTER UNIT AND A SECONDARY FILTER UNIT AND FILTER CIRCUIT THEREWITH