Dustproof mask
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 24, 1999
Grant Date -
N/A
app pub date -
Jul 28, 1998
filing date -
Jul 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dustproof mask comprises a filter unit disposed inside a mask cover. The filter unit is provided with a baggy filter having an inhalation hole in a position corresponding to a mouth of a user. A boundary plate disposed adjacent the filter unit has vent holes opposing the inhalation hole. The user can only take in clean open air through the filter when the user inhales open air through the mouth and the user can only exhale inner air through the nostrils.
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