ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,132, issued on Sept. 30, was assigned to University of Cincinnati (Cincinnati).
"Multi-stage propeller system" was invented by Shaaban Abdallah (Cincinnati).
According to the abstract* released by the U.S. Patent & Trademark Office: "A propulsion system (50) is disclosed. The propulsion system (50) includes a first propeller (52), a second propeller (54), and a third propeller (56). The first propeller (52), the second propeller (54), and the third propeller (56) are arranged to rotate about a common axis and the second propeller (54) is disposed between the first propeller (52) and the third propeller (56). The first and third propellers (52, 56) are configured to rotate about ...