ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,391,571, issued on Aug. 19, was assigned to H.C. Starck Tungsten GmbH (Munich).
"Method for preparing ammonium metatungstate" was invented by Julia Meese-Marktscheffel (Goslar, Germany), Armin Olbrich (Seesen, Germany), Anja Weiland (Langelsheim, Germany), Frank Van Der Putten (Goslar, Germany), Tino Sauberlich (Bad Harzburg, Germany), Tobias Schroer (Bad Harzburg, Germany) and Jurgen Muller (Pforzheim, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a process for preparing ammonium metatungstate using a reverse osmosis cell, and to a device for performing the process according to the invention."
The patent was f...