Nebulizer bacteria filter

Claim 1

A filter device comprising in combination a pair of housing sections, each section having an opening therethrough and a peripheral flange in confronting relationship with the peripheral flange of the other section to define an enclosed chamber, a continuous ridge on the peripheral flange of one section and a continuous complementary groove on the flange of the other section adapted to receive said ridge, an annular protrusion in the peripheral flange of said one section spaced from and radially outwardly of said ridge, a second groove in said flange of said other section radially spaced outwardly from said complementary groove to receive the protrusion on the flange of said one section and align said sections with respect to each other, a planar filter element disposed between said sections and extending radially outwardly of said flange to an extent sufficient to overlie said radially innermost groove and ridge such that the ridge on the one flange forces a portion of the filter into the groove of the flange of the other section and the protrusion on the one flange and the second groove on the flange of said other section cooperate to align said housing sections while simultaneously tensioning said filter element, and means uniting said housing sections and said filter element along the peripheral surface of said flanges to seal the filter element in said chamber.