ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,342, issued on March 3, was assigned to ARASE AIZAWA AEROSPATIALE LLC (Shizuoka, Japan).
"Unmanned aircraft" was invented by Kunio Arase (Hamamatsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An unmanned aircraft which has uniform lift and the overall airframe dimensions of which can be made small is disclosed. This unmanned aircraft is provided with four propeller shafts jutting horizontally along diagonals from the airframe, and four propellers constituted from twin blades having folding mechanisms. Engine rotation is transmitted to the propellers by gears. The unmanned aircraft features that all of the propellers are at the same height ...