ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,374, issued on June 3, was assigned to VALINGE INNOVATION AB (Viken, Sweden).
"Symmetric tongue and T-cross" was invented by Peter Derelov (Helsingborg, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A set including a first panel, a second panel and a mechanical locking device for locking the first panel to the second panel, the mechanical locking device includes an insertion groove at the second edge surface, a flexible tongue positioned in the insertion groove and an edge tongue including a tongue groove, the flexible tongue includes a first locking surface and a second locking surface, the first locking surface is configured to cooperate wi...