ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,167, issued on April 15, was assigned to Weatherford Technology Holdings LLC (Houston).
"Downhole apparatus" was invented by James Patrick Massey (Leadville, Colo.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An explosive assembly for a downhole tool operable to connect and selectively disconnect within a wellbore a first portion of a downhole tool string and a second portion of the downhole tool string. The explosive assembly includes an explosive charge, a detonator switch operable to detonate the explosive charge, and a housing assembly containing the explosive charge and the detonator switch. The explosive assembly may be movable as a single un...