US Patent 7856785 Floor panel with a tongue, groove and a strip

A thin rectangular laminate floor panel with one pair of long edges and one pair of short edges, the floor panel having an upper decorative wear layer; a core layer arranged beneath the upper decorative wear layer, the core layer being made of a material that is not as hard as the upper decorative wear layer; the floor panel having a substantially planar upper top side and a substantially planar lower underside and which is substantially parallel to the upper side. Also, having a long-side tongue, a short-side tongue, a long-side strip integrally formed with the floor panel, a short-side strip integrally formed with the floor panel, a long-side locking groove, and a short-side locking groove.