(19)
(11) EP 3 919 155 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
16.03.2022 Bulletin 2022/11

(43) Date of publication:
08.12.2021 Bulletin 2021/49

(21) Application number: 20804890.0

(22) Date of filing: 26.03.2020
(51) International Patent Classification (IPC): 
B01D 39/20(2006.01)
F01N 3/022(2006.01)
F01N 3/28(2006.01)
 B01D 46/00(2022.01)
F01N 3/24(2006.01)
(52) Cooperative Patent Classification (CPC):
F01N 3/022; F01N 3/24; F01N 3/28; B01D 2239/1216; B01D 2239/1208; B01D 39/2072; B01D 2239/12; B01D 2239/10; B01D 46/2429; B01D 46/24492; B01D 46/2498
(86) International application number:
PCT/JP2020/013513
(87) International publication number:
WO 2020/230461 (19.11.2020 Gazette 2020/47)
(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: 15.05.2019 JP 2019091929

(71) Applicant: DENSO CORPORATION
Kariya-shi, Aichi 448-8661 (JP)

(72) Inventor:
  • IMAGAWA Hirokatsu
    Kariya-city, Aichi 448-8661 (JP)

(74) Representative: Kuhnen & Wacker Patent- und Rechtsanwaltsbüro PartG mbB 
Prinz-Ludwig-Straße 40A
85354 Freising
85354 Freising (DE)

   


(54) EXHAUST-GAS CLEANING FILTER


(57) In an exhaust gas purification filter (1), the partition wall (12) has communicating pores (120). Each of the communicating pores (120) has a surface opening (121) on the gas-inflow-side surface and a plurality of portions (122), each of the portions of each of the communicating pores having a diameter, the diameter of each of the portions of each of the communicating pores being reduced and then increased again from the surface opening (121) of the corresponding one of the communicating pores, one of the portions of each of the communication pores, whose diameter is the smallest, being defined as an inlet neck portion (122N) of the corresponding one of the communication pores. As viewed in cross section in a thickness direction of the partition wall (12), the surface opening (121) of each of the communication pores (120) has a diameter defined as a surface opening diameter (A), the inlet neck portion (122N) of each of the communication pores has a diameter defined as an inlet neck diameter (B). The inlet neck diameter (B) of each of the communication pores is smaller than the surface opening diameter (A) thereof, and an average value of the inlet neck diameters (B) of the communication pores is 15 µm or less. A surface opening ratio of the communicating pores (120) in plan view of the gas-inflow-side partition wall surface is 40% or more.