Diesel exhaust filters
US6322605A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | May 31, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/30
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A filter for trapping and combusting diesel exhaust particulates comprising a microwave-absorbing filter body formed from a ceramic material having a general formula selected from the group consisting of A.sub.1-x M.sub.x B.sub.1-y M'.sub.y O.sub.3-.alpha., where A and M are selected from the group consisting of Na, K, Rb, Ag, Ca, Sr, Ba, Pb, La, Pr, Nd, Bi, Ce, Th and combinations thereof; where B and M' are selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Rh, Ru, Pt, Zn, Nb, Ta, Mo, W and combinations thereof; wherein, the chemical formula is electrostatically balanced; (A'.sub.a R.sub.r M".sub.m)(Z).sub.4 (X).sub.6 O.sub.24, where A' is from Group IA metals; where R is selected from Group IIA metals; where M" is selected from the group consisting of Mn, Co, Cu, Zn, Y, lanthanides and combinations thereof; where Z is selected from the group consisting of Zr, Hf, Ti, Nb, Ta, Y, lanthanides, Sn, Fe, Co, Al, Mn, Zn, Ni, and combinations thereof; where X is selected from the group consisting of P, Si, As, Ge, B, Al, and combinations thereof; wherein, the chemical formula is electrostatically balanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.