ALEXANDRIA, Va., June 10 -- United States Patent no. 12,290,844, issued on May 6, was assigned to IDENTINANO AB (Gothenburg, Sweden).

"Method for sorting of items and an assembly for categorizing an item" was invented by Alexander Friemann Dmitriev (Gothenburg, Sweden) and Rafael Cichelero (Angered, Sweden).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for sorting of items (1) based on material type, comprising: -depositing an array of nanostructures (3) onto a surface portion of an item (1) to form a material identification tag (2), the nanostructures having an optical response dependent on the material type of the item onto which they are deposited, -illuminating the material identification tag us...