Today in 1905, US Patent 798942 A was issued, an invention of Leo Baroch, for his “Beverage-Keg.” There’s no Abstract, although in the description it includes this summary:

The object of my invention is to provide a portable beverage-keg provided with a cooling-chamber and a gas-chamber filled with carbonic-acid gas and a beverage-receptacle, the instrumentalities being so constructed that as the beverage is siphoned from the receptacle the remaining fluid within the receptacle may be kept in an effervescent condition as well as be continuously under a charge of carbonic-acid gas drawn from the gas-chamber, and my invention embodies certain other instrumentalities, as will be described more fully hereinafter.