Abstract: Automotive gas purifiers having a tubular core for conveying hot exhaust gases from an entrant opening to an exit opening in a hollow casing which surrounds the core, a plurality of transversely louvered openings in said tubular core and providing a plurality of small passages in said core means for passage of exhaust gases into and out of the annular space, a transverse wall dividing said annular space into an upstream segment and a downstream segment, a body of small catalyst particles for purifying said hot exhaust gases in said annular space of said upstream segment and surrounding said passages within said upstream segment, wrappings of fiberglass substantially filling the downstream segment of said annular space, said tubular core being a one-piece tube or a two-piece tube in which tubular core is divided into an upstream part extending from the gas entrant end of said casing to one side of said transverse wall and a downstream part extending from the opposite side of said transverse wall to the gas exi

Abstract: Internal combustion engine exhaust gas muffler and purifier with segmented hollow shell and removable middle segment, said shell having an upstream exhaust gas expansion chamber, a downstream sound-absorbing and sound-collecting chamber, and a middle, removable cartridge receiving housing, the cartridge being filled with small particles of exhaust gas purifying material.