ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,562, issued on Feb. 17, was assigned to CLEO ROBOTICS INC. (Boston).

"Concentric vertical ducted propulsion for aerial vehicles" was invented by Omar Eleryan (Boston), Szymon Czarnota (Boston) and Luiz Sampaio (Boston).

According to the abstract* released by the U.S. Patent & Trademark Office: "Systems, methods, and devices include an aerial vehicle (AV) with a plurality of coaxially aligned vertical ducts. The lower vertical duct has a larger diameter than the upper vertical duct. Furthermore, the upper vertical duct at least partially contains a first propulsion component and the lower vertical duct at least partially contains a second propulsion component. The lower vertical d...