Today in 1975, US Patent 3875303 A was issued, an invention of Josef Hieber, assigned to Interbrew Betriebs Und Beteilg, for his “Preparation Of Beer.” Here’s the Abstract:

Beer is produced from a wort concentrate by a process involving sterilizing and desalting water, providing the sterilized and desalted water with a controlled salt content, dissolving a wort concentrate having at least 80% dry substance content in the water and fermenting with yeast to produce beer. The wort concentrate is dissolved in the water with a jet mixer and fermentation is carried out in a vessel containing a cooling chamber located above a centrifuge drum having therein plates for separating yeast and an impeller for circulating wort.