Patent ID: 8382993

Claim:
A drain filter apparatus, comprising: a filter housing with a watertight filtering chamber having a forward, cylindrical section and a relatively wider and larger aft section extending laterally outwardly from the forward cylindrical section and having a top and a bottom; means for connecting an upstream drain pipe to the top of the forward cylindrical section of the watertight filtering chamber; means for connecting a downstream drain pipe to the bottom of bottom of the forward cylindrical section of the filter housing; and a filter element mounted at an intermediate location within the chamber and extending coextensively with both the forward section and aft section of the filtering chamber and sealed against interior walls of the filtering chamber to divide the chamber into an upstream part above the filter element and a downstream part beneath the filter element, said filter element having a generally planer filter body with a forward, relatively narrow, primary filtering portion within the forward cylindrical section and located directly beneath the upstream drain pipe connecting means, and an aft, relatively wider, secondary filtering portion within the aft section of the filtering chamber and extending laterally outwardly from the relatively narrow primary filtering portion with a width and a cross-sectional area that is substantially larger than the diameter and cross-sectional area of the forward portion of the filter element, of the forward section of the cylindrical filtering section and of the upstream drain pipe.