Disposable dust respirator

Claim 1

A dust respirator adapted to be worn upon the face of a wearer, the respirator comprising: a. an initially generally planar surface of filter medium, having a vertical and a horizontal dimension, being centrally folded in the horizontal direction to form upper and lower opposed faces; having at least one horizontal pleat essentially central to said opposed faces to foreshorten the filter medium in the vertical dimension, having at least one additional horizontal pleat in each of said opposed faces wherein said central pleat together with said pleats in the opposed faces form a self-supporting pocket, wherein the central pleat is shorter in the horizontal dimension relative to the pleats in the opposed faces which are each shorter in the horizontal dimension relative to the maximum horizontal dimension of the filter medium, having the opposed faces joined vertically at the extreme ends of each of said pleats; b. a yieldable deforming conforming means horizontally extending at least partially across the upper opposed face capable of conforming the opposed face to the nasal contour of the wearer; and c. attachment means for releasably securing the respirator upon the face of the wearer.