Air-pollution filter and face mask
AssigneeStanley I. Wolf
InventorCharles L. Mulchi
Life of this patent
Estimating the term…
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.
Claims49
A filter having a plurality of component elements which, in combination, provide means for passing a gas stream therethrough at a flow rate which, per circular section of about 5 centimeters in diameter, is in the range of from 50 .+-. 20 liters per minute at a pressure drop of at most about 6.0 centimeters of water, the elements comprising, in sequence:
- i. porous compressible means to filter contaminated gas;
- ii. particulate activated charcoal means;
- iii. low-resistant prefilter means to supplement physical filtration provided by (i);
- iv. low-resistant filter means for filtering particulate matter as small as 0.3 micron in diameter;
- v. absorbent means to trap moisture and to protect (iii) and (iv) from mechanical damage;
- and
- vi. means to support and protect preceding elements;
- the porous compressible filter means providing means for removal of large dust particles, pollen grains, other particulate matter and aerosol droplets from the gas stream;
- the particulate activated carbon means providing means for removal of irritating gases from the gas stream;
- each element being in direct contact with adjacent elements, exerting a positive pressure against such adjacent elements to maintain them in position and having its designated function under such pressure.
A filter having a plurality of component elements which, in combination, provide means for passing a gas stream therethrough at a flow rate which, per circular section of about 5 centimeters in diameter, is in the range of from 50 .+-. 20 liters per minute at a pressure drop of at most about 6.0 centimeters of water, the elements comprising, in sequence:
- i. particulate activated charcoal means intermeshed in porous compressible means to filter contaminated gas;
- ii. low-resistant prefilter means to supplement physical filtration provided by (i);
- iii. low-resistant filter means for filtering particulate matter as small as 0.3 micron in diameter;
- iv. absorbent means to trap moisture and to protect (ii) and (iii) from mechanical damage;
- and
- v. means to support and to protect preceding elements;
- the porous compressible filter means providing means for removal of large dust particles, pollen grains, other particulate matter and aerosol droplets from the gas stream;
- the particulate activated carbon means providing means for removal of irritating gases from the gas stream;
- each element being in direct contact with adjacent elements, exerting a positive pressure against such adjacent elements to maintain them in position and having its designated function under such pressure.
Dependencies are inferred from the claim text.