Patent ID: 6138791
Filing Date: 2000-10-31
Classification: F01N

Abstract:
A fibrous sheath of sound absorbing material for use as the sound attenuating element disposed between the outer surface of an inner tubular partially-perforated element and the inner surface of an outer tubular sleeve element of a three-element muffler pipe, the sheath comprising a tubular, porous, resilient mat of compressed and hardened fibrous material having inner and outer surfaces, and a hardening agent, as initially applied, located between the inner and outer surfaces, the inner surface of the sheath fabricated to form a close fit with the outer surface of the inner tubular partially perforated element of the three-element muffler pipe, and the outer surface of the sheath fabricated to form a close fit with the inner surface of the outer tubular sleeve element of the three-element muffler pipe.