An improved, efficient, and regenerable exhaust emission filter and filter system are provided which incorporate the use of an inorganic, non-woven fiber filter element. The filter is able to capture exhaust pollutants and particulates through the interwoven nature of the filter element and due to area...http://www.google.com/patents/US6946013?utm_source=gb-gplus-sharePatent US6946013 - Ceramic exhaust filter
