Today in 1969, US Patent 3443397 A was issued, an invention of Thomas A. Donovan and William E. Miltenberger, assigned to Anheuser Busch, for their “Barrel Cooler.” There’s no Abstract, but the invention is described as a “barrel cooler which is inexpensive, pleasing in appearance, leakproof, and collapsible so that it may be stored in a small space or transported in collapsed condition.” They continue with more:

The present invention is embodied in a collapsible barrel cooler made from water impervious material, said cooler having inner and outer walls adapted to be positioned in spaced relation for receiving a coolant there between such as ice and water, said inner wall being adapted to be secured over the top of a barrel positioned therein to retain said inner wall in an upright position, said inner and outer walls having an opening therein near the bottom thereof for receiving a faucet for drawing off the contents from the barrel, said opening being leakproof so that no ice or water leaks out of the space between said walls.