Patent ID: 7553414

Claim:
A device for filtering ferromagnetic material from a fluid in which said material is suspended, comprising a magnet and a pair of metal plates, said magnet having faces of opposite magnetic polarity, each of said plates being disposed in abutment with a respective one of said magnet faces, each of said plates comprising a plurality of recesses about an outer perimeter of the plate to form radially extending magnetic pole pieces, which extend beyond an outer perimeter of said magnet faces, said plates being oriented so that said recesses and pole pieces on a first one of said plates are aligned with said recesses and pole pieces on the second of said plates, a plurality of passage means for said fluid, each extending between respective opposed recesses on said first and second plates and a plurality of regions of magnetic attraction to which ferromagnetic material is attracted and retained, said regions of magnetic attraction being spaced apart around the periphery of the plates, each said region of magnetic attraction extending between opposed said pole pieces and adjacent regions of magnetic attraction being separated by one of said plurality of passage means, wherein each of said recesses is further provided with one or a plurality of slots.