ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,459, issued on March 18, was assigned to SAUDI ARABIAN OIL COMPANY (Dhahran, Saudi Arabia).

"In-situ monitoring of chemical fingerprints in oilfield applications" was invented by Adrian Cesar Cavazos Sepulveda (San Pedro Garza Garcia, Mexico), Damian Pablo San Roman Alerigi (Dhahran, Saudi Arabia) and Jose Oliverio Alvarez (Houston).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system for monitoring a composition includes: an electromagnetic source that emits a beam; one or more evanescent field sensing element inside a tubular structure, arranged in series along a flow direction of the composition, and configured to be in direct contact with the...