Dustproof mask

Details Dustproof mask Dustproof mask

1998-07-28

1999-08-24

Asher, Kimberly L.

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

12820612, 12820615, A62B 710, A62B 700

Patent

active

059412445

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.

REFERENCES:
patent: 1925764 (1933-09-01), Le Duc
patent: 2111995 (1938-03-01), Schwartz
patent: 2174370 (1939-09-01), Schwatz
patent: 2228218 (1941-01-01), Schwartz
patent: 2284949 (1942-06-01), Cover
patent: 3724174 (1973-04-01), Walkenhorst
patent: 5706804 (1998-01-01), Baumann et al.

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