ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,472, issued on June 3, was assigned to LINDE GMBH (Pullach, Germany).
"Storage tank for liquid hydrogen with fill level indicator" was invented by Herbert Aigner (Reut-Taubenbach, Germany) and Manfred Schonberger (Tacherting, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A storage tank for liquid hydrogen having an outer tank, an inner tank which is arranged inside the outer tank, and a device for indicating a predefined fill level has been reached with a cell which can be arranged inside the inner tank and is filled with a gas which liquefies when the cell is dipped into the liquid hydrogen, further having a pressure indicator device which ...