ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,461,488, issued on Nov. 4, was assigned to TOPPAN INC. (Tokyo).
"Optical identifier and printed matter" was invented by Satoshi Uchida (Tokyo) and Akihito Kagotani (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical identifier including a recording surface, a plurality of deflection cells each of which has recorded thereon a range in which light to be diffracted is deflected, at least one spatial phase modulator which fills a space between the deflection cells on the recording surface, and a deposition layer which covers part or all of the recording surface. The deflection cells has a spatial frequency expressed in a form of a relief structu...