Today in 1959, US Patent 2883999 A was issued, an invention of Sandor Frankfurt, assigned to the Champion Safe Tap Company, for his “Tapping Device.” There’s no Abstract, although in the description it includes this summary:

This invention relates to the tapping of kegs of beer or like beverage and more particularly to a novel form of draft tube, tap rod or conduit means.

Broadly the invention comprehends the provision of a tap rod, or liquid conduit means, for use in the siphoning of beer or the like from containers, such as beer keg, having valve means incorporated therein for inhibiting the retrograde flow of beer from the rod or conduit to the keg, said valve means being movable axially to open or closed position by the flow of beer in the rod.