Film electret and an electret filter
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United States of America Patent
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-
Oct 26, 1993
Grant Date -
N/A
app pub date -
Mar 12, 1991
filing date -
Mar 12, 1990
priority date (Note) -
Expired
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Abstract
A film electret and an electret filter that contain a polar high-molecular weight compound and that provides a TSDC curve having a homocharge peak temperature of at least 95.degree. C. and a heterocharge peak temperature of at least 80.degree. C.
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