Today in 1919, US Patent 1299379 A was issued, an invention of Robert J. Owens, for his “Wild-Oat and Barley Separator.” There’s no Abstract, although in the description it includes this summary:

The object of my invention is to provide a separator which will dispense entirely with fans and air currents and wire sieves and of such devices as flannels, carpets and the like, frequently found in machines of this type for separating and grading grains.

A further object is to provide a machine by means of which not only wild oats but small, imperfect kernels of grain can be separated from the full, plump kernels that are suitable for seed.