Today in 1975, US Patent 3867551 A was issued, an invention of Yves Germain Jaegle, for his “Preparation of Beer.” Here’s the Abstract:

Beer is prepared by a process wherein groups of batches of wort are turned serially at temperatures increasing from 10 DEG to 14.5 DEG C into a cylindrical, vertically disposed vat having a conical bottom. Convection currents are instituted to homogenize the contents of the vat and fermentation is carried out until a beer of the desired degree of fermentation is formed. The resultant beer is mellowed by a warm keep phase, cooled and subjected to a cold keep phase.