ALEXANDRIA, Va., March 31 -- United States Patent no. 12,591,174, issued on March 31, was assigned to Molecular Imprints Inc. (Austin, Texas).

"Microlithographic fabrication of structures" was invented by Vikramjit Singh (Pflugerville, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "Asymmetric structures formed on a substrate and microlithographic methods for forming such structures. Each of the structures has a first side surface and a second side surface, opposite the first side surface. A profile of the first side surface is asymmetric with respect to a profile of the second side surface. The structures on the substrate are useful as a diffraction pattern for an optical device."

The patent was filed...