Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2005-08-26
2009-11-03
Benson, Walter (Department: 2837)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S237000, C181S251000, C181S212000
Reexamination Certificate
active
07610993
ABSTRACT:
A flow-through muffler includes a plurality of heat conducting walls, baffles, or partitions that together define a plurality of passages arranged to form acoustic waveguides, attenuators, and/or cancellation chambers, the walls, baffles, or partitions increasing a surface area exposed to the exhaust gases to facilitate extraction of heat while attenuating or canceling the resulting sound pressure waves. The muffler may have a cooling arrangement mounted thereon, and thermoelectric generator elements or other heat-powered device, such as a reformer, connected across the heat differential between the cooling arrangement and an exterior surface of the muffler housing that is in thermal contact with the heat conducting walls, bafflers, or partitions. In addition, the muffler may be made tuneable by providing a device for varying a length of one of the passages relative to another passage, and by including a sound cancellation chamber at an intersection of the passages. In addition, the internal surfaces of the muffler may be coated with a catalyst to provide a combination muffler and catalytic converter.
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Bacon & Thomas PLLC
Benson Walter
Phillips Forrest M
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