Today in 1942, US Patent 2291367 A was issued, an invention of Albert A. Bezosky, for his “Device For Warming and Reconditioning Beer.” There’s no Abstract, although in the description it includes these claims:

This invention relates to a device designed for reconditioning stale beer, or beer which has become flat or too cold for immediate consumption.

An important object of the invention is to provide a device of this character which may be used primarily by bartenders, and one which is of the electrical portable type which may be readily and easily immersed in a glass of beer, by the bartender, thereby replacing the head on the beer, or tempering it to render the beer exceptionally palatable.

An apparatus for treating liquid by submersion, comprising a body of pistol-like construction, electric wires extending through the body and terminating in a socket at one end of the body, said body including a handle extended at right angles with respect to the body, an electric plug adapted to be fitted in the socket, resistance wires extending from the plug and disposed in parallel relation with the handle, said resistance wires being in circuit with the wires extending through the body, and said resistance wires being formed into a loop at the free end thereof.