Today in 1941, US Patent 2253883 A was issued, an invention of Valentine Beecher, for his “Beverage Dispensing Display Bar.” There’s no Abstract, although in the description it includes these claims:

The main object of the invention is to provide a beer dispensing system in which a transparent, insulated dispensing riser extends directly from a beer keg in a pre-cooling chamber through a bar or counter provided with transparent windows through which the riser and its contents may be seen at all times.

Another object of the invention is to provide a transparent dispensing riser of the character referred to constructed in the manner of the well known Thermos or vacuum bottle to maintain the temperature of the beer’being dispensed during its passage from kegs in the pre-cooling chamber to a dispensing faucet mounted on the bar or counter, and thereby eliminate the cooling coils, air ducts and ice chambers heretofore used for this purpose.