Electroacoustic novelties
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United States of America Patent
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May 3, 1994
Issued Date -
N/A
app pub date -
Dec 23, 1991
filing date -
Oct 7, 1988
priority date (Note) -
Expired
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Abstract
An electroacoustic novelty, particularly to the brim on an article of headware, or to a flag, containing a piezoelectric polymer film, where means are electrically coupled with electrodes on the film for applying an audio-frequency signal voltage across the film to cause the film to vibrate and emit sound waves.
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