Patent ID: 6604604
Filing Date: 2003-08-12
Classification: F01N

Abstract:
A catalytic muffler comprising a housing having an inlet, an outlet and a plurality of catalyst-coated perforated cups between said inlet and outlet such that exhaust flowing through said housing from said inlet to said outlet is acoustically attenuated and catalyzed by said cups, wherein said housing extends axially, wherein each cup has an open end, a closed end, and a closed-loop sidewall between said open end and said closed end, each cup being perforated along a perforation pattern through at least one of said closed ends and said sidewall, and wherein said cups are stacked in nested axially overlapped relation with said closed ends adjacent each other, said sidewalls adjacent each other in concentric relation, and said open ends adjacent each other, and comprising support structure providing a gap between at least one of: (a) said closed ends; and (b) said sidewalls.