Today in 1941, US Patent 2230905 A was issued, an invention of Louis L. Popky, for his “Beverage Cooling Apparatus.” There’s no Abstract, although in the description it includes this summary:

The present invention relates to new and useful improvements in apparatus for cooling and dispensing beer and similar beverages, and has for its primary object to provide a dispensing cabinet of a portable nature in which the dispensing faucet is mounted, the faucet being connected to the keg positioned in a room remotely disposed with respect to the cabinet and providing a mechanical cooling unit for circulating air over a set of cooling coils through the cabinet as well as through the room in which the keg is positioned.

A further important object is to provide air ducts leading from the storage room for the beer keg into the cabinet where the same is subjected to the cooling influence of the refrigerant coil and also providing an air duct leading from the cabinet to the storage room for delivering the cooled air to the latter and mounting a beer pipe from ‘the keg in the storage room to the faucet in said cold air duct to further lower the temperature of the beer before the same reaches the faucet.