ALEXANDRIA, Va., May 26 -- United States Patent no. 12,638,381, issued on May 26, was assigned to Halliburton Energy Services Inc. (Houston).

"Determining ion concentration through downhole optical spectroscopy" was invented by Rohin Naveena-Chandran (Houston), James Martin Price (Houston), Bin Dai (Katy, Texas), Syed Muhammad Farrukh Hamza (Houston) and Vinay K. Mishra (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "Methods and systems for determining one or more ion components. The method may include disposing a fluid sampling tool into a wellbore wherein the fluid sampling tool includes at least one probe to fluidly connect the fluid sampling tool to a formation in the wellbore, and at least one p...