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Patents

Duos holds several patents related to ash recycling technologies. These patents, born out of innovation and a desire to improve, have helped Duos become the global leader in ash recycling technologies.

US 5,308,368 - Stijgzifter
DM/015012 - Windzifter International Design Right
US 6,308,435 B1 - Process & Facility MWC Ash
US 5,992,776 - Ash Recycling Process
US 5,906,321 - Martin Tag™
U.S. 5,890,663 - Recovery of Ferrous Values from MSW Process
U.S. 6,589,654 B1 - Construction Materials and Method