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On December 1, 2015 , the USPTO issued U.S. Patent Number 9,199,022 to Fresenius Medical North America, Inc., which was successfully prosecuted by Novel IP.
01 Dec, 2015
News

The '022 patent is directed towards a dialysis system having a reservoir module with a reservoir housing defining an internal space, a surface located within the internal space for supporting a container that contains dialysate, and a conductivity sensor located within the internal space, where the conductivity sensor has a coil, a capacitor in electrical communication with the coil, and an energy source in electrical communication with the circuit.

Independent Claim 1 describes "a reservoir module for use in a portable dialysis system comprising: a reservoir housing having four sides, a base, and a top, wherein said four sides, base surface, and top surface define an internal space; a reservoir pan located within said internal space for supporting a volume of dialysate, wherein said reservoir pan is further configured as a scale to measure a weight of the volume of dialysate; and a conductivity sensor in built into a bottom surface of said reservoir pan and positioned below said volume of dialysate, wherein said conductivity sensor comprises a flat coil having a plurality of turns, a capacitor in electrical communication with said flat coil, said flat coil and capacitor defining a circuit, and an energy source in electrical communication with said circuit, wherein said flat coil generates a magnetic field and wherein said circuit is adapted to detect changes in said magnetic field."