Signals and indicators – Horns – whistles and compressional wave generators
Reexamination Certificate
2010-09-02
2011-10-04
Smith, R. A. (Department: 2841)
Signals and indicators
Horns, whistles and compressional wave generators
C116S140000, CD10S119300, C446S206000
Reexamination Certificate
active
08028642
ABSTRACT:
A whistle for producing resonant frequencies comprising a body which includes a mouth piece having an inlet, and at least two sound chambers to which inlet air is blown from the inlet. The whistle further includes air passageways for communicating inlet air from the inlet to the sound box and sound chambers. The body further includes at least two exhaust ports in communication with the sound chambers for discharging air and sound. The two sound chambers are dimensioned to create peak principal frequencies which interactively produce a pulsating sound having a periodic pulse frequency of less than 100 hertz. The whistle preferably includes air intake ports for communicating additional port air into the sound box.
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Courson Tania
Smith R. A.
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