Disposable filter for a vacuum cleaner

Claim 1

A disposable filter especially suited for use as a dust and debris collection device for a vacuum cleaning apparatus, said filter comprising an assemby of juxtaposed layers, as follows: (a) a first outer support layer of highly porous fabric formed of synthetic fibers, said fabric having an air permeability of at least 100 m 3 /min/m 2 and a grab strength of at least about 1.0 kg; (b) an inner filter layer formed of a web comprising randomly interentangled synthetic polymeric micro-fibers having an average diameter of about 2 to 6 microns and having a weight of about 70 to 140 g/m 2 and an air permeability of about 8 to 20 m 3 /min/m 2 ; and (c) a second outer supper layer of highly porous fabric formed of synthetic fibers, said second outer support layer being disposed on the opposite side of said web from said first outer support layer, said fabric of said second layer having an air permeability of at least 50 m 3 /min/m 2 and a grab strength of at least about 1.0 kg wherein said layers are disposed with said first outer support layer positioned to initially receive an air stream passing through said layers.