Respirator

Claim 1

A respirator mask for filtering or purifying air adapted to be worn over the face which comprises (i) an inturned lip forming a turnover seal edge as the outer contact surface for sealing contact of the edge of the mask to the wearer's face and means for increasing seal integrity comprising at least two other contact surfaces each comprising a feathered flexible extension of the inturned lip internal to the turnover seal edge, each extension angled inwardly to the face and making acontact with the face, the most interior of which is a primary inner seal at the inner edge of the inturned lip, and at least one other such extension extending from the inturned lip between the primary inner seal and the turnover edge seal, each of said flexible extensions varying in length around the mask, being shorter at the nose and longer at the chin, whereby each of said contact surfaces makes sealing contact with the face along the perimeter of the mask providing multiple pressure pockets between the multiple seals and less chance for leaks, and (ii) a plurality of horizontal pleats across the front lower portion of the mask for vertical expansion and contraction to facilitate talking by the wearer without substantial movement of the turnover seal edge, and (iii) one or more one-way exhalation valves at the front of the mask above said pleats and in the direct line of expelled breath to allow expelled breath to exit the mask through said valves and (iv) two or more one-way inhalation valves, one on each side of said mask over the cheeks to allow air to enter the mask and flow across the face.