Abstract: The present invention is generally related to a new construction for a resistor-type anode. Sacrificial anodes are used in a variety of applications to protect metallic structures from corrosion. In order to control the rate of consumption of the sacrificial anode, a resistor is placed in series between the anode and the tank (cathode). This invention relates to an improved resistor anode construction for use in a tank, for example a hot water tank. The anode includes a core wire with a spring welded to the exposed end. The spring is biased against a disc shaped resistor. The assembly is retained by a metal cap swaged over an insulating sleeve fitted on the end of the anode.

Abstract: A shaped, sacrificial anode for water tanks and a method of constructing the same from extruded sections is disclosed, particularly an anode having a greater mass adjacent to regions of the tank where improved corrosion protection is needed.