Today in 1968, US Patent 3394647 A was issued, an invention of Fritz Reiter, for his “Apparatus For the Production of Wort.” There’s no Abstract, although in the description it includes these claims:

In an apparatus for the production of wort, a filter drum for the separation of the wort from the spent grains comprises suction means to draw the wort into the drum and means cutting the cake of spent grains accumulating on the periphery of the drum, while it is being sparged, into small readily extracted pieces.