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.