Ceramic honeycomb filter for purifying exhaust gases
US4857089A · kind A · utility
93Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Jan 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A ceramic honeycomb filter for purifying exhaust gases from combustion engines includes a ceramic honeycomb structure formed by extruding and having a number of through-passages alternately closed at their ends by ceramic closure members. The through-passages formed by partition walls for capturing fine particles in the exhaust gases accumulated on the partition walls. The ceramic honeycomb filter comprises porous ceramic layers provided on the partition walls over a distance of 1/10-8/10 of an effective length of the filter from outlet ends of said through-passages for the exhaust gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.