Patent ID: 8069991

Claim:
A filter device for liquid filtration, the device comprising: a filter bowl; a filter membrane contained within the filter bowl; a head section comprising at least one inlet connector and at least one outlet connector; and a filter core surrounded by the filter membrane, an outside surface of the filter core and an inside surface of the filter bowl forming a tight fit with the filter membrane, the filter core comprising a cross hole extending across the diameter of the filter core and being open on both of its ends to fluid communication with the filter membrane, the outside surface of the filter core not permitting fluid communication of the filter membrane with an internal core volume of the filter core except via the cross hole; an equivalent fluid flow diameter of the cross hole, an equivalent fluid flow diameter of the inlet connector and an equivalent fluid flow diameter of the outlet connector being roughly equal to each other; and the cross hole being located at or near a surface of the filter core nearest to the head section and being in fluid communication with the at least one outlet connector.