On the rhine there are ship cleaning the river flour to keep bargs flowing along. The river flour pumps work like this, the outer side spin and inside screw is still. That ships are decades old and use the same machines ever. On the beach the dry mud is pumped from the ship like this the same.<br>In factorys for creating fireworks the use the same things moving black power to keep from explosions for a long time.<br>So this is nothing new. Maybe using for sugar and food stuff maybe new and patents are for restricted areas only.