Today in 1966, US Patent 3279493 A was issued, an invention of David Zurit and Michael J. Parisi, assigned to the Tap Rite Products Corp., for their “Valve Assembly For Kegs.” There’s no Abstract, although in the description it includes these claims:

This invention relates to apparatus for tapping liquid containing vessels, such as beer kegs. The invention will be described as embodied in beer-tapping apparatus, but some features are not so limited within the scope of the appended claims. More particularly, the invention relates to apparatus that fits into the tapping hole of a keg and that has a valve which seals the opening when in one position and which leaves the interior of the keg in communication with a beer line or faucet when in another position.

It is an object of the invention to provide tapping apparatus of the character indicated with an improved vertically extending inlet that can be made long enough for withdrawing the contents of the keg down to the last few ounces of liquid within the keg.

It is a more specific object of the invention to provide a valve of the character indicated with an inlet fitting that turns with the valve and that moves into a position where it is exposed to the free flow of cleaning fluid in the keg when the valve is closed and the keg is in position for Washing.

It is another object of the invention to provide an improved valve construction with a static sealing disk having a novel structure for preventing rotation of the seal and having a shape that forms with the other parts of the apparatus a channel for unobstructed drainage of cleaning fluid from the inlet fitting of the value.