ALEXANDRIA, Va., June 25 -- United States Patent no. 12,339,254, issued on June 24, was assigned to POSCO (Pohang-si, South Korea).
"Ultrasonic testing apparatus with variable frequency" was invented by Choong-Soo Lim (Gwangyang-si, South Korea), Hyeong-Jun Huh (Gwangyang-si, South Korea) and Sang-Jin Lee (Gwangyang-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an ultrasonic testing apparatus with a variable frequency, which can automatically change the frequency according to thickness and thereby detect internal defects in objects having various thicknesses. The ultrasonic testing apparatus may comprise: a nozzle jetting a medium toward an object so as to fo...