ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,504,135, issued on Dec. 23.
"Light string" was invented by Miaoyin Deng (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A light string, including a power supply cord and circuit boards. The power supply cord has welding portions, and each circuit board is welded to a corresponding set of welding portions. The power supply cord includes a first, a second, and a third wire. Each circuit board is arranged with a first, a second, and a third light-emitting element; a positive electrode of the first light-emitting element is connected to the first wire, and a negative electrode is connected in parallel to the second wire and the third wire; ...