ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,941, issued on July 29.
"Self-aligning jamb jack screw with partial sphere" was invented by Charles James Spofford (Greenfield, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A self-aligning jamb jack apparatus with a cylindrical threaded adjustment component that has adjustment component threads on the exterior wall and smooth surface on the interior walls, the cylindrical threaded adjustment component extending through a cylinder with a smooth exterior to a ball (or cut-off sphere), the smooth surface extending through the cylinder and the ball (or cut-off sphere). The jamb jack apparatus also has a platform base with a socket configured to ...