Today in 1984, US Patent 4481791 A was issued, an invention of Gary L. German, for his “Insulated Beer Keg Cooler.” Here’s the Abstract:

An insulated cooler for beer kegs which is specifically constructed to enclose both half-barrel and quarter-barrel kegs by inverting the top cover. The cooler has insulated bottom, top and side walls and encloses the keg with ice surrounding the same and provides an access opening through which the pump and tap assembly extends. Suitable handles are provided for carrying the keg and ice pack unit.