ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,435,632, issued on Oct. 7, was assigned to Duplicent LLC (Santa Monica, Calif.).

"Rotational engine with inner and outer rings" was invented by Curren Emmett Krasnoff (Santa Monica, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rotational engine system comprises a rotational engine and a propulsion system. The rotational engine includes an outer ring enclosure, an inner ring component, and a drive gear. The inner ring component includes a piston and a drive gear engagement portion. The piston is configured to travel within the outer ring enclosure along a circumference of the outer ring enclosure. The drive gear engagement portion is configured...