Exhaust system for internal combustion engine having...

Details Exhaust system for internal combustion engine having... Exhaust system for internal combustion engine having...

2011-05-10

2011-05-10

Enad, Elvin G (Department: 2832)

Acoustics

Sound-modifying means

Muffler, fluid conducting type

C181S237000, C181S244000, C181S254000

Reexamination Certificate

active

07938226

ABSTRACT:
A muffler for an internal combustion engine featuring two flowpaths for exhaust through the muffler. A first serpentine pathway is substantially longer than a second pathway through the muffler, thereby providing increased sound attenuation. Temperature activated internal valves operate to change the exhaust flowpath from the first flowpath to the second flowpath through the muffler as exhaust gasses warm the muffler and the temperature actuated valves.

REFERENCES:
patent: 1709426 (1929-04-01), Beery
patent: 1860146 (1932-05-01), Gray
patent: 4527659 (1985-07-01), Harrington
patent: 6739579 (2004-05-01), Rim
patent: 7325651 (2008-02-01), Kikuchi et al.
patent: 2005/0061580 (2005-03-01), Wiemeler et al.
patent: 2005/0132696 (2005-06-01), Tumati et al.
patent: 2007/0227807 (2007-10-01), Meneely et al.

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