Dense medium separation

ESR International LLC patented a unique bi-directional dense medium barrel that proved to be the most accurate dense medium separator ever employed in the separation of a variety of materials ranging from carrots and potatoes to plastics and non-ferrous metals (US patent 5,373,946 of Dec 20, 1994). This invention was further supported by two additional patents: US patent 5,495,949 of March 5, 1996 and US patent 6,024,226 of Feb 15, 2000.