Today in 1993, US Patent 5203181 A was issued, an invention of Charles E. Brossia, Philip S. Desmond, and Eckhard F. Rahn, assigned to Miller Brewing Company, for their “Container-Cooler.” Here’s the Abstract:

A container-cooler for a beverage, such as beer, includes a conventional keg-shaped outer shell, an inner vessel for containing the beverage retained within the shell, and a space between the inner vessel and the outer shell for receiving a cooling medium, such as ice.