ALEXANDRIA, Va., April 21 -- United States Patent no. 12,606,328, issued on April 21, was assigned to Kubota Corp. (Osaka, Japan).
"Unmanned flying craft" was invented by Ikuo Osawa (Ota, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An unmanned aerial vehicle includes a power generator, a first electrical component, a second electrical component, a main battery capable of being charged with power generated by the power generator, a sub-battery, and a charging circuit connecting the second electrical component and the sub-battery. The sub-battery is configured to be charged by receiving power from the second electrical component through the charging circuit, and configured to supply power to the first...