ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,925, issued on Aug. 26, was assigned to University of the District of Columbia (Washington).
"Geothermal heat exchanger" was invented by Jiajun Xu (Silver Spring, Md.) and Takele Gemeda (Washington).
According to the abstract* released by the U.S. Patent & Trademark Office: "A one-piece, unitarily formed compact geothermal heat exchanger comprises a one-piece body having an external screw-type configuration including a cutting tip and a spiral thread extending from the cutting tip upwards towards the top of the body of the heat exchanger. The top face of the body includes a working fluid inlet and a working fluid outlet, each of which are in communication with an internal continu...