Today in 1958, US Patent 2847309 A was issued, an invention of Harold Howard Rohrbeck, assigned to the Olympia Brewing Company, for his “Brewing Process.” There’s no Abstract, although in the description it includes this summary:

Heretofore, in the conventional brewing process, it has taken considerable time toV filter the wort through the lautering bed provided by the grain in the lauter tub and also to sparge the bed. I believe the reason for this is that the lines, which are microscopic glutinous protein matter, have collected in the interstices of the filtering bed and have restricted and even completely closed them thus slowing down the filtering step.

It is a main object of the present invention to provide a brewing process overcoming the above disadvantage.

A further object of the present invention is to provide a process in which all or part of the fines are removed from the mash prior to the mash entering the lauter tub whereby to speed up the filtering operation.

A further object of the present invention is to provide an apparatus by which the method of the present invention may be carried out.

The process -of the present invention is characterized by the steps of separating the fines from at least a part of the mash prior to the mash being conducted to the lauter tub so that the filter bed is not nearly as congested or restricted by the presence of the fines as heretofore has been the case and thus the filtering action of the bed is much more rapid than heretofore.