ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,246, issued on Dec. 30, was assigned to RTX Corp. (Farmington, Conn.).

"Collection of boil off gas at airport gate" was invented by Neil J. Terwilliger (Cheshire, Conn.) and Marc J. Muldoon (Marlborough, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A cryogenic fueled aircraft propulsion maintenance system includes a fuel system of an aircraft, the fuel system includes a cryogenic fuel tank that is configured to maintain the fuel in a liquid phase during aircraft operating conditions, a gas collection system where boil off gas from the fuel system is collected, and a fuel reliquification system that is configured to receive boil off gas from ...