Today in 1903, US Patent 722509 A was issued, an invention of Samuel M. J≥ House, for his “Cooler for Kegs or Casks.” There’s no Abstract, although in the description it includes this summary:

My invention relates to a new and useful improvement in coolers for kegs or casks, and has for its object to provide the kegs or casks with an interior receptacle one end of which opens through one head of the keg, and into this receptacle may be placed cracked ice, liquid air, or any cooling substance for the purpose of cooling the contents of the keg or cask.