ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,147, issued on Jan. 13, was assigned to SCHLUMBERGER TECHNOLOGY Corp. (Sugar Land, Texas).

"Ultrasonic borehole classification method" was invented by Mizuki Yajima (Sagamihara, Japan), Naoki Sakiyama (Katy, Texas), Hiroaki Yamamoto (Sugar Land, Texas) and Kong Hauw Sarwa Bakti Tan (Sugar Land, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for classifying a subterranean formation includes rotating an ultrasonic logging tool in a borehole penetrating a formation. The ultrasonic logging tool includes an ultrasonic transducer and an array of spaced apart ultrasonic receivers deployed on a logging tool body. The ultrasonic logging tool m...