Air-pollution filter and face mask

Details Air-pollution filter and face mask Air-pollution filter and face mask

1977-03-04

1979-02-27

Recla, Henry J.

Gas separation

With separating media bypass or system gas pressure relief

Valved bypass means

55487, 55527, 55DIG31, 55528, 528DIG33, 1281426, B01D 5000

Patent

active

041417038

ABSTRACT:
A flexible polymeric mask, which covers the mouth and at least the lower part of the nose, has exhale-valve means and vertical supporting means for air-intake filter means. The filter means provides a wearer of the mask with air which has passed, in sequence, through, e.g., porous foam, activated charcoal, filter paper, absorbent cellulose and gauze.

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Katz et al., The Universal and the Fireman's Gas Masks, 1923, pp. 4 & 5, Technical Paper No. 300, Dept.of Interior.

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