Rare Earth Technologies Inc. (RETi) Rare Earth Technologies, Inc. (RETi) is a mineral concentrate processor and refiner of rare-earth elements, founded in 2021 and based in Ohio, US. RETi is developing a chromatography technology for the separation and purification of mixed rare earth oxides from mining and recycled magnet feedstocks. IDTechEx spoke with Chuck Joffe, Chief Commercial Officer at Rare Earth Technologies Inc. (RETi). Rare Earth Technologies Inc. (RETi)