Honeycomb filter
US8361399B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2008 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Aug 9, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D46/2498
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A honeycomb filter 1 of the present invention includes a honeycomb structure 2 having partition walls 7 and plugging portions, and the partition walls 7 are constituted of a porous layer in which a first wall portion 7a having an average pore diameter of 20 μm or more and carrying an oxidation catalyst 11 on the inner surfaces of formed pores 8, a second wall portion 7b functioning as a buffer and having a high porosity, and a third wall portion 7c having an average pore diameter of 1 to 15 μm and a porosity of 50 to 90% are laminated in the thickness direction of the partition walls 7 from a surface side where cells 9a having opening end portions opened on an inflow side and opening end portions plugged on an outflow side are defined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.