ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,448,159, issued on Oct. 21.
"Drone" was invented by Sang Hyun Lee (Busan, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A drone having a fuselage in which a battery is mounted and a forward direction is set in an x-axis. A plurality of rotors disposed about the fuselage in four or more, each rotational axis of which is aligned in a z-axis direction. An x-axis tilting mechanism formed to tilt the plurality of rotors about an axis parallel to the x-axis. A y-axis tilting mechanism formed to tilt the plurality of rotors about an axis parallel to the y-axis. A first drive motor drives the y-axis tilting mechanism unit. A second drive motor driv...