US Patent Issued to Arizona Board of Regents on behalf of the University of Arizona on June 24 for "Diffractive trifocal lens" (Arizona Inventor)

ALEXANDRIA, Va., June 25 -- United States Patent no. 12,339,526, issued on June 24, was assigned to Arizona Board of Regents on behalf of the University of Arizona (Tucson, Ariz.).

"Diffractive trifocal lens" was invented by James T. Schwiegerling (Tucson, Ariz.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A diffractive multifocal lens is disclosed, comprising an optical element having at least one diffractive surface, the surface profile comprising a plurality of annular concentric zones. The optical thickness of the surface profile changes monotonically with radius within each zone, while a distinct step in optical thickness at the junction between adjacent zones defines a step height. The step heights f...