ALEXANDRIA, Va., July 28 -- United States Patent no. 12,692,348, issued on July 28, was assigned to Massachusetts Institute of Technology (Cambridge, Mass.).

"Synthesis of novel poly(ester urea)s for drug delivery" was invented by Bradley D. Olsen (Arlington, Mass.), Hursh Vardhan Sureka (Cambridge, Mass.) and Katharina Fransen (Cambridge, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are poly(ester urea)s containing two or more units containing two amino acid monomers linked by a linker. At least two units of the poly(ester urea)s are covalently bonded via a urea bond. Suitable amino acid monomers are lysine, arginine, aspartic acid, phenylalanine, or a side chain protected derivative there...