Drumhead
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 26, 1999
Grant Date -
N/A
app pub date -
May 15, 1997
filing date -
May 15, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polymer film drumhead having indentations in the surface, the indentations placed strategically by size, number and placement near the periphery of the drumhead to control the vibrational characteristics and the overtone content of the drumhead when struck.
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