Today in 1953, US Patent 2629988 A was issued, an invention of Samuel Lee, for his “Refrigerating Jacket.” There’s no Abstract, although in the description it includes this summary:

My invention is an improvement in refrigerating jacket for vessels containing beverages and. coupled to tap lines through which the contents are withdrawn and served.

An important object of this invention is to provide a cooling or refrigerating apparatus having such construction that it can be employed to control the temperature of a keg or barrel of ale or beer, for example, in close proximity to the point where the beverage is delivered to the consumer. In its preferred form the apparatus is a unit and comprises a jacket having means to receive and carry a refrigerating agent and adapted to envelop the keg or barrel from which the beverage is to be taken.

Another object is to provide a refrigerating unit that is easy to handle and will keep a barrel or keg sufficiently cool till it has been emptied. The need for a cooling chamber and long delivery lines to the bar or counter is thus eliminated.