ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,729,644, issued on Sept. 8, was assigned to Rolls-Royce plc (London).

"Gas turbine engine" was invented by Martin K. Yates (Derby, Great Britain) and Michael C. Willmot (Sheffield, Great Britain).

According to the abstract* released by the U.S. Patent & Trademark Office: "A fuel system for a hydrogen fuelled gas turbine engine comprises a tank configured to store hydrogen, a pump configured to provide pressurised hydrogen at an outlet thereof, and a pre-heater configured to heat at least a portion of pressurised hydrogen fuel downstream of the pump. A preheater return offtake is configured to return at least a portion of hydrogen fuel heated by the preheater to the tank."

The patent...