ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,487,112, issued on Dec. 2, was assigned to FENRI Co. LTD. (New Taipei, Taiwan).
"Liquid level gauge and waveguide set" was invented by Shueh-Ting Lin (New Taipei, Taiwan) and Yung-Yun Cheng (New Taipei, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid level gauge and waveguide set includes a liquid level gauge installed on a vertical wall of a sewer, so that the liquid level detection module of the liquid level gauge emits radar waves or ultrasonic waves toward a sewage pipeline buried in a ditch on the bottom surface of the sewer for liquid level sensing, and a waveguide fixed on the vertical wall of the sewer with one end thereof facing t...