ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,521,920, issued on Jan. 13, was assigned to Essilor International (Charenton-le-Pont, France).
"Method for generating microstructure on a film by a roller" was invented by Haifeng Shan (Dallas).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to a method of designing a spherical microstructure mold (604-614) module to be incorporated into a calendering roller (600) for generating a microstructure (108) on a planar surface (104), comprising calculating a first curvature (204) on a cross-sectional planar surface (202) for a first microstructure point of the spherical microstructure mold module, calculating a second curvature (2...