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publicationNumber US-8303693-B2
titleOfInvention Nanofiber filter facemasks and cabin filters
abstract A filtration medium includes a fine filter layer having a plurality of nanofibers and a coarse filter layer having a plurality of microfibers attached to the fine filter layer. The coarse filter layer is positioned proximal to a direction of fluid flow, and the fine filter layer is positioned distal to the direction of fluid flow.
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