ALEXANDRIA, Va., April 21 -- United States Patent no. 12,604,924, issued on April 21, was assigned to DELFORTGROUP AG (Traun, Austria).
"Wrapper paper with improved flame resistance" was invented by Roland Zitturi (Innsbruck, Austria) and Dietmar Volgger (Gnadenwald, Austria).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wrapper paper is described that is suitable for use on aerosol-generating articles and which comprises pulp fibers and one or more polyphosphates, wherein the pulp fibers make up at least 55% and at most 95% of the mass of the wrapper paper and the polyphosphates are together contained in a concentration of at least 5% and at most 30% with respect to the mass of the wrapper paper. In this ...