Today in 1914, US Patent 1092999 A was issued, an invention of William R. Kinnear, for his “Metallic Keg.” There’s no Abstract, although in the description it includes this summary:

The object of my invention is to provide a beer keg with an inner and an outer shell, each shell being made in two pieces and joined together at the center with a liquid proof joint, the inner shell being enameled on the inside and the outside; the connection joining the two sections of each shell being such that the shells may readily be taken apart and examined, and if the enamel should in any way become defective, the inner shell can be removed from the outer and re-enameled.

A further object of my invention is to provide a liquid shock absorber and a nonconductor in the space between the inner and outer shells, which distributes any shock which may be given to the keg throughout the entire area of the absorber and thus protects the inner shell from said shocks and preserves the enamel intact, the non-conductor preventing the passage of heat.

A further object of my invention is to construct the joint between the sections of each shell in such manner that the securing means is in the space between the two shells, so that the inner face of the inner shell presents an unbroken enameled surface; and with these and other objects in view, my invention consists of the parts and. combination of parts as will be hereinafter more fully pointed out.