Patent ID: 7552797

Claim:
A vehicular exhaust system for dissipating at least one pressure wave, the system comprising: a first generally cylindrical tube having a first end that receives the at least one pressure wave, a second end that directs the at least one pressure wave to an outlet tube, a first length extending therebetween, and a first plurality of apertures contained therein; a second generally cylindrical tube extending a second length from a proximal end proximate to the first end to a distal end, the second generally cylindrical tube located radially outward of the first generally cylindrical tube and coaxial therewith, thereby forming a first generally annular passageway between the first generally cylindrical tube and the second generally cylindrical tube, the second generally cylindrical tube having a second plurality of apertures that are substantially the same size as the first plurality of apertures; the outlet tube coupled to the first generally cylindrical tube; a partition plate positioned within the first generally cylindrical tube at an axial distance along the first length, wherein the axial distance is slightly shorter than the second length and the partition plate is positioned proximate to the distal end of the second generally cylindrical tube, the partition plate having a third plurality of apertures, and the partition plate being located adjacent to a taper of a diameter of the first or the second generally cylindrical tube; and a canister having a generally cylindrical wall, an inlet opening, and an outlet opening, wherein the first end of the first generally cylindrical tube is fixed to the inlet opening and the outlet tube is fixed to the outlet opening of the canister, the canister containing an insulating material between the cylindrical wall and the second generally cylindrical tube; wherein the partition plate permits a portion of the at least one pressure wave to pass through the third plurality of apertures in the partition plate and directs the remaining portion of the at least one pressure wave to pass through the first plurality of apertures and into the first generally annular passageway.