ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,595, issued on April 15, was assigned to Halliburton Energy Services Inc. (Houston).

"Material test sub including one or more retainer assemblies for downhole environmental exposure" was invented by Fraser Murray (Singapore), Shanshan Yu (Singapore) and Thanh Nam Vu (Singapore).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a downhole material test sub assembly, a well system including the same, and a method for using the same. The downhole material test sub assembly, in one aspect, includes a flange for coupling to a mandrel, and one or more retainer assemblies coupled to the flange, the one or more retainer assemblies configured to accep...