ALEXANDRIA, Va., May 26 -- United States Patent no. 12,637,943, issued on May 26, was assigned to CARBO CERAMICS INC. (Houston).

"Systems and methods for differentiating non-radioactive tracers downhole" was invented by Jeremy Zhang (Katy, Texas) and Harry D. Smith Jr. (Spring, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for evaluating induced fractures in a wellbore includes obtaining a first set of data in a wellbore using a downhole tool. The method also includes pumping a first proppant into the wellbore after the first set of data is obtained. The first proppant includes a first tracer that is not radioactive. The method also includes pumping a second proppant into the wellbore. The se...