Today in 1959, US Patent 2888944A was issued, an invention of Rudolph H. Breeback, assigned to Crown Cork & Seal Co., for his “Filling System.” There’s no Abstract, though it’s described this way in the application. “The present invention relates to a filling system and more particularly to a system for delivering beer or other carbonated beverages to a filling machine.”

An object of this invention is the provision of a system for delivering beer to a reservoir of a filling machine whereby the supply of liquid in the reservoir will be controlled by a pressure actuated switch so connected to the reservoir that the pressure acting upon the switch is controlled by the liquid level within the reservoir.

Another object of this invention is the provision of a system for delivering beer to a reservoir of a filling machine whereby the pressure and level of the liquid in the reservoir can be controlled within a range independent of the level and pressure of the liquid in government tank.