STIFFENED FILTER MASK
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United States of America Patent
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app pub date -
Jan 25, 2010
filing date -
Jun 5, 2002
priority date (Note) -
Abandoned
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Abstract
A flat-folding mask includes a filter layer forming a rim. The filter layer has first and second side panels extending from the rim. A substantially centrally located front panel bridges the first and second side panels, the front panel being substantially flat. The filter layer further includes a fused portion that is seamless and spaced from the rim. Triangular pleats may add support to the side walls and increase the effective filtration area of the mask.
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