Today in 1973, US Patent 3780198 A was issued, an invention of Leo F. Pahl and Norman H. Jones, assigned to the Crown Cork & Seal Co., for their “System For Carbonating Beverages.” There’s no Abstract, although in the description it includes these claims:

It is one object of this invention to reduce the cost of carbonating beverages.

It is another object of this invention to improve sanitation. in the carbonation of beverages.

It is a further object of this invention to provide a carbonating system for beverages which is easily cleaned.

It is a still further object of this invention to achieve specified levels of carbonation in beverages with a high degree of accuracy.

It is also an object of this invention to achieve a specified level of carbonation without requiring numerous and continuous manual adjustments.

It is an additional object of this invention to permit filling of beverages at a low pressure.