Today in 1966, US Patent 3279534 A was issued, an invention of Robert C. Gadsby, Joseph Schwaiger and Frank H. Schwaiger, assigned to Anheuser-Busch, for their “Percolator for a Brew Kettle.” There’s no Abstract, although in the description it includes this summary:

One of the principal objects of the present invention is to provide an improved percolator for brew kettles, such as are used in the brewing industry. Another object is to provide in such a percolator a plurality of flat heating sections which can be easily cleaned and replaced or repaired if necessary. Another object is to provide an improved percolator design which is shaped to distribute heat in a predetermined manner :and which is shaped so as to create a natural flow of the liquid being heated within the percolator. Another object is to provide a percolator of a design in which there is little likelihood of trapping condensate therein. Another object is to provide connectors between the relatively flat heater sections which prevent entrapment of the liquid so as to prevent the overheating of any liquid which might otherwise become entrapped.