ALEXANDRIA, Va., June 25 -- United States Patent no. 12,337,609, issued on June 24, was assigned to Digimarc Corp. (Beaverton, Ore.).
"Encoding signals with fluorescing inks" was invented by Alastair M. Reed (Lake Oswego, Ore.) and Ajith M. Kamath (Beaverton, Ore.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to signal processing such as digital watermarking and other encoded signals. One claim recites a substrate comprising a plurality of first areas and a plurality of second areas, in which each of the plurality of first areas comprises a color ink printed therein with a UV topcoat layer printed over the color ink, in which the UV topcoat layer includes a material that absor...