Today in 1909, US Patent 918096 A was issued, an invention of Otto Selg and Carl Guntrum, assigned to Selg Brewery Apparatus Co., for their “Apparatus For Separating and Washing Yeast.” There’s no Abstract, although in the description it includes this summary:

This invention relates to improved means for washing yeast and separating the lighter particles and impure matter from the pure heavy particles in a quick, simple and efficient manner.