ALEXANDRIA, Va., July 15 -- United States Patent no. 12,663,415, issued on June 23, was assigned to AAT Bioquest Inc. (Sunnyvale, Calif.).

"Chromogenic and fluorogenic compounds and their use for biological detection" was invented by Zhenjun Diwu (Sunnyvale, Calif.), Qinglin Meng (Sunnyvale, Calif.), Ruogu Peng (San Jose, Calif.) and Qin Zhao (Sunnyvale, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The disclosure provides chromogenic and fluorogenic compounds comprising amino acid or peptide appendages that are capable of detecting an activity in a bioassay. Also provided herein are methods for detecting a biological activity in a sample with the subject chromogenic and fluorogenic compounds. In one...