Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2011-03-15
2011-03-15
Enad, Elvin G (Department: 2832)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S212000, C181S232000, C181S247000, C181S248000
Reexamination Certificate
active
07905319
ABSTRACT:
A venturi muffler is made of a plurality of metallic tubular stepped members which are stacked together and define at least one sound-reflective chamber which opens through an annular venturi passage into an axial flow passage of the venturi muffler thereby creating a partial vacuum in the annular chamber. The annular chambers include aligned openings through which exhaust gasses flow but are also reflected by walls of the sound-reflective chambers. Therefore, the exhaust sound or noise is dampened by the cancellation of sound waves 180 degrees out of phase with each other, the creation of a partial vacuum through which sound cannot propagate or propagates minimally, and by the heat removed by all of the metallic heat-conductive venturi-forming segments of the venturi muffler.
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Enad Elvin G
Miles & Stockbridge P.C.
Phillips Forrest M
Schaffer, Esq. David R.
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