ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,429,369, issued on Sept. 30, was assigned to Welldata (Subsurface Surveillance Systems) Ltd. (Fife, Great Britain).
"Fluid detection" was invented by Sydney Joseph Littleford (Fife, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A material level detection device for detecting a material level includes a cable or transmission line having a coaxial cable and an electromagnetic transmitter and receiver arrangement connected or connectable to the cable or transmission line. The cable or transmission line acts as an antenna and includes an inner conductor and an outer conductor having a plurality of apertures or slots provided in a spaced rela...