Today in 1873, US Patent 144119 A was issued, an invention of Samuel Marks, for his “Improvement in Beer-Drawing Attachments for Casks.” There’s no Abstract, although in the description it includes these claims:

The object of my invention is to provide an attachment to a cask or other vessel by means of which beer, ale, or porter, under a pressure of gas, can be drawn into glasses, bottles, or other vessels without the usual excess of foam, but regulated by the operation from brisk sprinkling to any extent of foam desired; and it consists of a receptacle having a controllable valve and a porous plug in it, arranged between the keg and the point of drawing the beer, whereby I am enabled to allow the escape of more or less of the gas from a small quantity of the beer in said receptacle.