ALEXANDRIA, Va., Feb. 12 -- United States Patent no. 12,221,853, issued on Feb. 11.
"Downhole plug" was invented by Chris Molzahn (Edmonton, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "A downhole plug, has an inner mandrel and a sealing assembly carried on and surrounding an outer surface of the inner mandrel. The sealing assembly is positioned between a lower support downstream of the sealing assembly and a setting shoulder upstream of the sealing assembly. The sealing assembly is activated from a deactivated state to a sealing state by causing the setting shoulder and the lower support to apply a compressive force to the sealing assembly such that an elastomeric seal extrudes outward into sealing...