Patent ID: 6371307
Filing Date: 2002-04-16
Classification: B01D,Y10S

Abstract:
A filter envelope for a filter frame element, comprising:a filter frame enclosure comprising planar first and second filter paper members lying atop one another, the first and second members defining lateral, medial, and base sides, the lateral, medial, and base side of the first member connected to the lateral, medial, and base side of the second member to define the enclosure, the top side of the first member not being connected to the top side of the second member so as to define an opening in the enclosure, and a closure comprising a planar third filter paper member connected to a portion of the second member proximate to the opening, the third member movable between a first position and a second position, the second position closing the opening in the enclosure wherein the first member of the enclosure has a first aperture for engaging a portion of the frame filter element therethrough and the third member has a second aperture for engaging a portion of the frame filter element therethrough.