Electret filter media
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 19, 2000
Issued Date -
N/A
app pub date -
May 29, 1997
filing date -
Aug 17, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An electret filter media, and mask, that is made of a nonwoven web of thermoplastic microfibers. The thermoplastic microfibers are of substantially the same composition, are nonconductive, and have an effective fiber diameter less than about 15 micrometers. The nonwoven web also has sufficient unpolarized trapped charge to exhibit an initial filtration quality factor of at least 0.31 when measured under the DOP Penetration and Pressure Drop Test.
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