Today in 1973, US Patent 3713839 A was issued, an invention of Cavit Akin, Jacques J. Delente, Erik Krabbe, and Elmer Lueckerath, for their “Fermentation Process.” Here’s the Abstract:

The process of handling fermenting medium such that the carbon dioxide released during fermentation is applied to the problem of creating an agitation regime for desirable product quality and heat dissipation, and apparatus having depth and bottom shapes that determine the agitation pattern and assist in heat dissipation.