ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,329, issued on April 29, was assigned to INVENTIO AG (Hergiswil, Switzerland).

"Elevator installation and operating and/or display panel for an elevator installation" was invented by Christoph Liebetrau (Menziken, Switzerland) and Alessandro D'Apice (Ebikon, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A landing door of an elevator system includes a door leaf that is equipped with an integrated operating and/or display panel. In the event of a fire, a printed circuit board of the operating and/or display panel is removed from the door leaf by activation of an ejection device comprising intumescent material and being positioned in the do...