Today in 1918, US Patent 1391561 A was issued, an invention of John C. Miller, for his “Food Product Obtained From Brewers’ Yeast.” There’s no Abstract, although in the description it includes these claims:
Brewers waste yeast when dried has for some years been utilized for a force feed for animals. When analyzed, the dried brewers yeast contains, on an average, about fifty-four per cent crude protein, twenty-five per cent nitrogen free extract, two per cent crude fat and ten per cent ash and fiber.
I have discovered that when properly prepared, a flour can be obtained from the brewers waste yeast which can be effectively and properly used when mixed with wheat flour, or when used by itself, as a food product for human consumption.
In the processes heretofore employed in drying brewers yeast, the material has been dried on steam heated rollers and scraped therefrom from by scraping knives, which renders the material coarse and gritty. The older dried products have never been suitable for either as a substitute for or when mixed with wheat flour for human consumption.
In preparing my product, the wet material in the preferred apparatus is delivered into the rapidly rotation cylinder from which it is discharged by centrifugal force at the delivery end of the cylinder in the form of a very fine annular spray and is there subjected to a current of heated air, which is blown annularly across the centrifugally discharged material, so that the moisture is very rapidly taken up and the material can be readily collected in the form of a dry powder free from grit and in the condition of a flour.