ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,419, issued on Sept. 23, was assigned to QUZHOU RESEARCH INSTITUTE OF ZHEJIANG UNIVERSITY (Quzhou, China).

"Preparation method for ultraviolet-responsive coumarin controlled-release and self-repairing anti-fouling paint" was invented by Qinghua Zhang (Quzhou, China), Zheming Tong (Quzhou, China) and Xiaoli Zhan (Quzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A preparation method for an ultraviolet-responsive coumarin controlled-release and self-repairing anti-fouling paint includes: reacting double-end-group reactive polydimethylsiloxane, polyisocyanate, and an organic diluting solvent; adding a dihydroxycoumarin compound, a cross-lin...