REGI U.S., Inc., through its subsidiary RadMax Technologies, Inc., designs, develops, and builds axial vane type rotary devices for civilian, commercial, and government applications. It offers RadMax compressed gas expander, a positive-displacement gas expander that captures kinetic and pressure-volume energy and converts it to rotational power in compressed gas expansion applications. The company also offers RadMax compressor that acts as a positive-displacement and centrifugal compressor; and RadMax combined function devices, which comprise two cams connected by a common driveshaft in a single housing. In addition, it offers RadMax positive-displacement pumps; and RadMax internal/external combustion engines. REGI U.S., Inc. was founded in 1992 and is headquartered in Spokane, Washington.