ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,402, issued on March 18, was assigned to Kuwana Metals Ltd. (Kuwana, Japan).
"Liquid level sensor" was invented by Akira Sasaki (Mie Ken, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid level sensor 1 comprises a sleeve 2 disposed so as to extend in the vertical direction, a float 3 configured so as to move along said sleeve according to fluctuation of liquid level, a resistor string 4, a plurality of grounding means 5 disposed inside the sleeve 2 and a liquid level signal output means 6 to take out an electric signal detected between a positive electrode side end part 4a and a junction part grounded by the grounding means 5 as a liqu...