Filter unit and dust-proof mask therewith
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United States of America Patent
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Oct 30, 2001
Grant Date -
N/A
app pub date -
Nov 15, 1999
filing date -
Nov 16, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a filter containing a filter material folded into a chrysanthemum shape. While such a filter can be made of an electret fiber nonwoven fabric or a fiberglass nonwoven fabric, preferably it is made of a polytetrafluoroethylene porous film that is extended lengthwise and widthwise such that the overall area is extended by more than fifty-fold.
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