Patent ID: 7320721
Filing Date: 2008-01-22
Classification: B01D

Abstract:
1. A chemical filter comprising: an inner circular tube having an air-permeability; an outer circular tube disposed around the inner circular tube, the outer circular tube having an air-permeability; a filter medium disposed between the inner and the outer circular tubes to remove contaminants contained in an air flow through the inner and the outer circular tubes; and a first cover detachably attached to top portions of the inner and the outer circular tubes to prevent an air flow through a top portion of the chemical filter; and a second cover detachably attached to bottom portions of the inner and the outer circular tubes, wherein an inner space of the inner circular tube and an inter-space between the inner and the outer circular tubes are defined by the first and the second covers, and wherein the second cover has a circular flat ring shape, an outer diameter of the second cover is substantially larger than that of the outer circular tube, outer edge portions of the second cover having an attachment means for coupling the chemical filter.