ALEXANDRIA, Va., March 12 -- United States Patent no. 12,247,131, issued on March 11, was assigned to SOCIETE BIC (Clichy, France), UNIVERSITE DE HAUTE-ALSACE (Clichy, France) and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (Paris).

"Process of preparation of an aqueous gel ink with fixed color comprising silver nanoparticles" was invented by Olivier Albenge (Clichy, France), Romain Metillon (Clichy, France), Karine Mougin (Paris), Feriel Ghellal (Clichy, France) and Arnaud Spangenberg (Mulhouse, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention concerns a process for preparing an aqueous gel ink with fixed color comprising the following steps: (i) preparing a gel-based matrix of a...