US2012291787A1PendingUtilityA1

Biohazard Mask Filter

44
Individually held — no corporate assignee on recordPriority: Jun 11, 2003Filed: Aug 7, 2012Published: Nov 22, 2012
Est. expiryJun 11, 2023(expired)· nominal 20-yr term from priority
Inventors:David R. Freriks
A41D 13/11B01D 39/1692B01D 2239/0442
44
PatentIndex Score
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Cited by
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References
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Claims

Abstract

An exhalate filter medium for a biohazard mask is made of polytetrafluoroethylene (PTFE) and surrounding layers of a wicking material and an antimicrobial material. The exhalate filter may be contained in a removable and replaceable cartridge snap-fit into the surface of a biohazard mask.

Claims

exact text as granted — not AI-modified
1 - 5 . (canceled) 
     
     
         6 . An exhalation filter medium having an ambient side and a face side, the medium comprising:
 (a) a PTFE layer,   (b) a first nonwoven polyolefin spun bond layer positioned on the PTFE layer on the ambient side of the medium and including a wicking material;   (c) a second nonwoven polyolefin spun bond layer positioned on the PTFE layer on the face side of the medium and the layer being impregnated with an antimicrobial material; and   (d) a third nonwoven and uncoated polyolefin layer positioned between the first layer and the PTFE layer or positioned between the second layer and the PTFE layer.   
     
     
         7 . The filter medium of  claim 6  further comprising a third nonwoven polyolefin layer positioned between the second layer and the PTFE layer and attached to both layers. 
     
     
         8 . The filter medium of  claim 7  further comprising a fourth nonwoven polyolefin layer positioned between the first layer and the PTFE layer and attached to both layers. 
     
     
         9 . The filter medium of  claim 8  wherein the fourth layer is inert. 
     
     
         10 . The filter medium of  claim 6 , wherein the PTFE layer has pore sizes within a range of 0.1-0.4 microns. 
     
     
         11 . The filter medium of  claim 6 , wherein the PTFE layer has pore sizes of 0.2 microns. 
     
     
         12 . A biohazard mask including separate inhalation and exhalation filters, the biohazard mask comprising:
 a plurality of receptacles for the holding at least a first filter cartridge containing an inhalation filter and a second filter cartridge containing an exhalation filter;   the exhalation filter comprising:   (a) a PTFE layer;   (b) a first nonwoven polyolefin spun bond layer positioned on the PTFE layer and including a wicking material;   (c) a second nonwoven polyolefin spun bond layer positioned on the PTFE layer and being impregnated with an antimicrobial material; and   (d) a third nonwoven and uncoated polyolefin layer positioned between the first layer and the PTFE layer or positioned between the second layer and the PTFE layer.   
     
     
         13 . The biohazard mask of  claim 12 , wherein the PTFE layer has a pore size within the range of 0.1-0.4 microns. 
     
     
         14 . The biohazard mask of  claim 13 , wherein the PTFE layer has a pore size of 0.2 microns.

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