ALEXANDRIA, Va., June 5 -- United States Patent no. 12,279,521, issued on April 15, was assigned to Merck Patent GmbH (Darmstadt, Germany).
"Materials for organic electroluminescent devices" was invented by Nils Koenen (Griesheim, Germany), Anna Hayer (Darmstadt, Germany), Florian Maier-Flaig (Weinheim, Germany), Jochen Pfister (Seeheim-Jugenheim, Germany) and Holger Heil (Frankfurt am Main, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to fluorene derivatives and electronic devices, particularly organic electroluminescent devices in which said compounds are used, particularly as a matrix material for phosphorescent emitters."
The patent was filed on Jan. 15, 2020, under Appli...