Air filter
AssigneePipercross Limited
InventorsBarry Spicer, Joseph T. Wills
Life of this patent
Estimating the term…
Abstract
An air filter for an internal combustion engine comprises a composite formed of first and second layers of reticulated foam plastics material with an open-mesh substrate between them, the two layers being bonded together through the openings in the open-mesh substrate and the composite impregnated with a dust-retaining substance. This arrangement results in a reservoir of the dust-retaining substance being maintained between the first and second layers of foam plastics material.
Claims29
An air filter comprising a first layer of reticulated foam plastics material, a second layer of reticulated foam plastics material, and an open mesh substrate at the interface between said first and second layers of foam plastics material, said first and second layers of foam plastics material being bonded together at said interface through the openings in said open mesh substrate, and said filter being impregnated with a dust-retaining substance and having a reservoir of said substance at the open mesh substrate between said first and second layers of foam plastics material.
An air filter which includes a layer of filter material and, upstream thereof, a further layer which comprises a reticulated foam plastics material which is dry, at least semi-rigid, and impregnated with plasticizer and is of sufficiently coarse pore size that its upstream surface behaves as a multiplicity of cyclone separators distributed over said surface.
An air filter which includes a layer of filter material and, downstream of said layer, a further layer of reticulated foam plastics material which has been impregnated with a plasticizer and post-treated with a fire-retardant substance, such that said layer acts as both a filter and a fire-break.
An air filter which includes a layer of filter material and, downstream of said layer, an additional layer of reticulated foam plastics material impregnated with plasticizer and of a sufficiently small pore size as to clog rapidly in the event of a rupture in or breakdown of the upstream layer.
An air filter comprising a layer of reticulated foam plastics filter material impregnated with plasticizer and profiled to increase its effective area.
An air filter comprising a layer of reticulated foam plastics material impregnated, at an elevated temperature, with a plasticizer so as to partially plasticize said foam plastic material.
Dependencies are inferred from the claim text.