ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,228,155, issued on Feb. 18, was assigned to Avdel UK Ltd. (Sheffield, Great Britain).
"Sealing plug" was invented by Carl Hersant (Letchworth Garden City, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sealing plug comprises the combination of a stem and sleeve, in which the stem is designed to have an external taper such that, on installation of the plug by a setting tool, sleeve material flows into a gap between the sleeve and taper to assist with locking the sleeve and stem together. Furthermore, the tool nose piece has a conical taper designed to cause sleeve material to flow, initially on installation, radially outward to effect loc...