ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,471,492, issued on Nov. 11, was assigned to Semiconductor Energy Laboratory Co. Ltd. (Japan).

"Organic compound, light-emitting device, light-emitting apparatus, electronic device, display device, and lighting device" was invented by Hiroshi Kadoma (Kanagawa, Japan), Satoshi Seo (Kanagawa, Japan), Harue Osaka (Kanagawa, Japan) and Tsunenori Suzuki (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A novel light-emitting device that is highly convenient, useful, or reliable is provided. An organic compound in which a substituted or unsubstituted naphtho[2,3-c]carbazolyl group or a substituted or unsubstituted benzo[c]naphtho[2,3-g]carbazolyl...