ALEXANDRIA, Va., June 2 -- United States Patent no. 12,644,378, issued on June 2, was assigned to Resman Technology AS (Trondheim, Norway).

"Monitoring and detecting seal integrity with tracers" was invented by John Daniels (Houston), Olaf Kristoffer Huseby (Oslo, Norway), Roy Greig (Aberdeen, Great Britain), Sven Kristian Hartvig (Raelingen, Norway), Douglas Alexander Pipchuk (Calgary, Canada) and Christopher N. Fredd (Centennial, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Methods and systems are provided for monitoring a tracer within a monitored system that includes at least three barrier layers and at least three corresponding tracers. The barrier layers-referred to as a first, second, and thir...