ALEXANDRIA, Va., July 16 -- United States Patent no. 12,671,389, issued on June 30, was assigned to The Regents of the University of California (Oakland, Calif.).

"Unapodization" was invented by James Friend (San Diego), Naiqing Zhang (San Diego), Cecile Floer (San Diego) and Amihai Horesh (San Diego).

According to the abstract* released by the U.S. Patent & Trademark Office: "An unapodized interdigital transducer apparatus, system, and associated methods. The apparatus includes a substrate, a pair of first electrodes oppositely positioned on the substrate, where an aperture is formed between the pair of first electrodes, and a plurality of variable length second electrodes arranged using a predetermined pattern defined by each second ele...