ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,397,892, issued on Aug. 26.
"Propeller" was invented by Yangri Zhao (Dallas) and Jiping Zhang (Dallas).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a propeller, including a main driving device. Foldable blades and a fixed propeller are detachably connected to a projecting shaft of a driving motor. When the foldable blades are arranged, the propeller can be used as a hydrofoil board booster, and be clamped to a vertical rod of the hydrofoil board. When a fixed propeller is surrounded by a water flow culvert pipe provided with water inlet grooves, the propeller can be handheld with a handheld bracket or worn to advance and play underwater. F...