ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,555, issued on Aug. 26, was assigned to Black & Decker Inc. (New Britain, Conn.).
"Undercut anchor" was invented by Philipp Mahrenholtz (Frankfurt, Germany) and Alan Armiento (New Rochelle, N.Y.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An undercut anchor having an at least partially threaded rod portion having an outer thread diameter DROD. The anchor having an expansion feature coupled to the rod portion and an expansion sleeve having an outer diameter DOUTER SLEEVE, an inner diameter DINNER SLEEVE and a wall thickness TSLEEVE. Furthermore, the expansion sleeve has a plurality of circumferentially distributed fingers which are configured to f...