The idea is also used by one of our own "Doc" with his multi -drop zoned mats of all different configurations. Plus Keene Eng. came out with the Triple sluice (split the flow and material years ago and the raised expanded ( I forgot the name of it) he is using , has been in use for a longgg time. BUT in this particular configuration looks like it worked great for that family he and Juan built it for. . They did get more gold from the second cleanup BUT their son had moved the dredge after Fred & Juan went to shore to build the new addition for the dredge BUT then again did they go back to the same spot to dig again so their base line was still correct

I don't know why Fred intends to patent this set up because by now everyone (except me)is trying it out for them selves to see if it'll work on their dredge up there in the wave action .!