# US 10,478,766 B2 · Honeycomb filter

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- Number: US 10,478,766 B2
- Document ID: US10478766B2
- Status: Granted
- Kind: B2
- Application number: 15/455,330
- Filed: 2017-03-10
- Published: 2017-09-28
- Granted: 2019-11-19
- Earliest claimed: 2016-03-23
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Fumihiko Yoshioka; Kazuto Miura
- Web page: https://patentgrep.com/patent/US10478766B2

## CPC

- B01D 46/2459: {of the plugs}
- B01D 46/247: {of the cells}
- B01D 46/2476: {Monolithic structures}
- B01D 46/2478: {Structures comprising honeycomb segments}
- B01D 46/2482: {Thickness, height, width, length or diameter}
- B01D 46/2484: {Cell density, area or aspect ratio}
- B01D 46/2486: {characterised by the shapes or configurations}
- B01D 46/249: {Quadrangular e.g. square or diamond}
- B01D 46/2492: {Hexagonal}
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A honeycomb filter includes a pillar-shaped honeycomb substrate including a porous partition wall that defines a plurality of cells extending from an inflow end face to an outflow end face, an inflow side plugging portion disposed at the inflow end face of the honeycomb substrate to plug open ends of outflow cells; and an outflow side plugging portion disposed at the outflow end face of the honeycomb substrate to plug open ends of inflow cells other than the outflow cells. The honeycomb substrate includes the partition wall that defines two of the inflow cells by division. An average of the plugging length LOUT of the outflow side plugging portions disposed in the inflow cells of the honeycomb substrate is larger than an average of the plugging length LIN of the inflow side plugging portions disposed in the outflow cells of the honeycomb substrate.

## Claims

### Claim 1

A honeycomb filter comprising:
a pillar-shaped honeycomb substrate including a porous partition wall that defines a plurality of cells extending from an inflow end face to an outflow end face;
an inflow side plugging portion disposed at the inflow end face of the honeycomb substrate to plug open ends of outflow cells that are a part of the plurality of cells; and
an outflow side plugging portion disposed at the outflow end face of the honeycomb substrate to plug open ends of inflow cells other than the outflow cells of the plurality of cells, wherein
the honeycomb substrate includes the partition wall that defines two of the inflow cells by division, and
an average of plugging lengths LOUT of the outflow side plugging portions disposed in the inflow cells of the honeycomb substrate is larger than an average of plugging lengths LIN of the inflow side plugging portions disposed in the outflow cells of the honeycomb substrate by 1.0 to 4.0 mm, and
the average plugging lengths LOUT is 3.5 to 7.0 mm.

### Claim 2 (depends on 1)

The honeycomb filter according to claim 1, wherein plugging length LOUT in the cell extending direction of the outflow side plugging portion disposed in one inflow cell of the inflow cells is larger than plugging length LIN in the cell extending direction of the inflow side plugging portion disposed in the outflow cell adjacent to the one inflow cell via the partition wall.

### Claim 3 (depends on 2)

The honeycomb filter according to claim 2, wherein the plugging length LOUT of the outflow side plugging portion disposed in the one inflow cell is larger than the plugging length LIN of the inflow side plugging portion disposed in the outflow cell adjacent to the one inflow cell via the partition wall by at least 1.0 mm.

### Claim 4 (depends on 3)

The honeycomb filter according to claim 3, wherein the plugging length LOUT of the outflow side plugging portion disposed in the one inflow cell is larger than the plugging length LIN of the inflow side plugging portion disposed in the outflow cell adjacent to the one inflow cell via the partition wall by 1.0 to 4.0 mm.

### Claim 5 (depends on 1)

The honeycomb filter according to claim 1, wherein the outflow cells and the inflow cells have different shapes at open ends.

### Claim 6 (depends on 1)

The honeycomb filter according to claim 1, wherein an area SOUT of the outflow cells at the open ends and an area SIN of the inflow cells at the open ends are different.

### Claim 7 (depends on 6)

The honeycomb filter according to claim 6, wherein the area SOUT of the outflow cells at the open ends is larger than the area SIN of the inflow cells at the open ends.

### Claim 8 (depends on 1)

The honeycomb filter according to claim 1, wherein the honeycomb substrate has a cell configuration, in which a plurality of the inflow cells surround one of the outflow cells.

### Claim 9 (depends on 1)

The honeycomb filter according to claim 1, wherein the outflow cells has a quadrangular cell shape and the inflow cells have a pentagonal or hexagonal cell shape.

### Claim 10 (depends on 1)

The honeycomb filter according to claim 1, comprising: a plurality of the honeycomb substrates; and a bonding layer disposed between lateral faces of the plurality of honeycomb substrates.