Electrically charged filter and mask
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United States of America Patent
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Mar 22, 2016
Grant Date -
Feb 28, 2013
app pub date -
May 2, 2011
filing date -
May 7, 2010
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Abstract
Provided is an electrically charged filter which has a high initial filtering efficiency and is not liable to decline in filtering efficiency, by including a liquid-charged nonwoven fabric layer that is charged by application of force via a polar liquid, and a tribo-electrically charged nonwoven fabric layer that is charged by friction between fiber components of a plurality of types.
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