ALEXANDRIA, Va., June 5 -- United States Patent no. 12,275,563, issued on April 15.
"Stackable container" was invented by Lancayle Heath Ham (Plant City, Fla.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A stackable container foldable from a unitary blank providing a tongue-and-groove configuration of interlocking panels and tabs. The tongue-and-groove configuration is in part defined by four tabs that are folded and fixed along an interior of the stackable container, wherein the tab provides a tongue element and wherein a bottom panel of the stackable container provides a groove element for receiving a tongue element of a subjacent container, thereby enabling stacking of two or more stackable containers, ...