ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,500,250, issued on Dec. 16, was assigned to AUDI AG (Ingolstadt, Germany).

"Method for operating a fuel cell device, the fuel cell device, and a motor vehicle outfitted with a fuel cell device" was invented by Sebastian Disson (Waghausel, Germany), Leonard Liphardt (Mainhardt, Germany) and Keigo Suematsu (Neckarsulm, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for operating a fuel cell device comprising a fuel cell stack having at least one fuel cell, involving the steps; a) drying of the fuel cell stack upon switching off the fuel cell device; b) determining the membrane residual water and the cathode residual water by means of elec...