Today in 1990, US Patent 4963175 A was issued, an invention of Donald E. Pace, for his “Keg Cooler Tub.” Here’s the Abstract:

A transportable keg cooler tub comprising a circular tub-like base with a pliable flexible canvas sleeve extending upwards from the top edge of the base. The sleeve enclosing a plastic liner in intimate contact with ice cubes filling the space between the liner and the enclosed beverage keg. A portion of the plastic liner pulled through an orifice on the bottom outside perimeter of the base providing drainage for the ice contained by the plastic liner.