Today in 1974, US Patent 3846397 A was issued, an invention of John H. Ernster, for his “Process For Utilizing Barley Malt.” Here’s the Abstract:
Grain residues from mashed barley malt are separated from wort thereby produced and heated in an alkaline solution to solubilize protein. The alkaline solution is separated from the unsolubilized grain residues and acidified to precipitate water soluble protein. Beer is brewed from the wort and the unsolubilized grain residue can be used as animal feed.
