ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,425, issued on Feb. 10, was assigned to Airbus (S.A.S.) (Blagnac, France).
"Optical level gauge apparatus and method, liquid tank assembly and vehicle employing the same" was invented by Jan Tepper (Taufkirchen, Germany) and Ricardo Barrios (Blagnac, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "To improve liquid level gauging inside liquid tanks, especially cryogenic liquid tanks, an apparatus and method for determining the liquid level are provided. A light source emits outgoing light rays that are back reflected or scattered by the tank wall of the liquid tank. The back reflected or scattered incoming light rays are received by a light co...