ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,623, issued on April 7, was assigned to FREUDENBERG PERFORMANCE MATERIALS B.V. (Arnhem, Netherlands).

"Primary carpet backing for latex free tufted carpets" was invented by Edze Jan Visscher (Utrecht, Netherlands), Arnold Koetsier (Westervoort, Netherlands) and Leonie Stigter (Driebergen, Netherlands).

According to the abstract* released by the U.S. Patent & Trademark Office: "A primary carpet backing for latex free tufted carpets, including tufting yarns tufted into the backing, the yarns consisting essentially of a first thermoplastic polymer selected from a polyamide, a polyester or a polyolefin, the polymer having a first melting temperature, and wherein the back stitches of ...