Exhaust emission control device manufacturing method

Metal working – Method of mechanical manufacture – Muffler – manifold or exhaust pipe making

Reexamination Certificate

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Details

C029S445000

Reexamination Certificate

active

07047641

ABSTRACT:
An exhaust emission control device is manufactured by sizing a housing of over a substrate and intumescent mat subsequently to heating said emission control device. The step of heating causes said intumescent mat to at least reach a temperature at which it swells. If the substrate has a washcoat layer, it may be left unfired until after it is assembled with the housing, in which case the step of heating causes the washcoat layer to sinter.

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