Charge stabilized electret filter media
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United States of America Patent
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Aug 24, 2004
Issued Date -
N/A
app pub date -
Apr 5, 1996
filing date -
Feb 28, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides, oleophobic fluorochemical surfactants, and mixtures thereof.
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