ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,514,107, issued on Dec. 30, was assigned to Merck Patent GmbH (Darmstadt, Germany).
"Organic electroluminescent apparatus" was invented by Amir Hossain Parham (Darmstadt, Germany) and Christian Ehrenreich (Darmstadt, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an organic electroluminescent device comprising a mixture comprising an electron-transporting host material and a hole-transporting host material, and to a formulation comprising a mixture of the host materials and to a mixture comprising the host materials. The electron-transporting host material corresponds to a compound of the formula (1) from the cla...