Patent ID: 7384609

Claim:
A catalytic converter device for cleansing exhaust gas emitted from an internal combustion engine, the catalytic converter device comprising: an elongated body having a longitudinal axis; an inlet portion located at one end of the elongated body for receiving the exhaust gas; a sleeve extending generally away from the inlet portion generally along the longitudinal axis; at least one depression formed in the sleeve, the depression having a depth, the depth of the depression increasing with increasing distance from the inlet portion; and a catalytic material disposed on the sleeve to form an active surface for reacting with the exhaust gas, a perimeter defined by the active surface in a plane perpendicular to the longitudinal axis, the perimeter increasing with increasing distance from the inlet portion, and a cross-sectional area defined by the active surface in a plane perpendicular to the longitudinal axis, the cross-sectional area decreasing with increasing distance from the inlet portion.