ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,224, issued on Dec. 30, was assigned to SUBARU Corp. (Tokyo).
"Rotorcraft including circular wings" was invented by Kensuke Yoshimura (Tokyo), Keisuke Tajiri (Tokyo) and Takeshi Fukurose (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rotorcraft includes a fuselage, rotors and circular wings. The rotors are attached to the fuselage. The rotors are attached to the fuselage. The circular wings are disposed under the rotors respectively. Upper surfaces of the circular wings have annular curved surfaces and thereby are convex upward respectively. The circular wings cause Coanda effects by the upper surfaces respectively. First lift is generated ...