ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,007, issued on April 15, was assigned to TECNICAS REUNIDAS S.A. (Madrid).
"Process for the recovery of zinc from zinc-bearing raw materials" was invented by Ana Belen Mejias Cordero (Madrid), Emilio Pecharroman Mercado (Madrid), Maria Frades Tapia (Madrid) and Sergio Sanguilinda Solan (Madrid).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention refers to an improved process for recovering zinc from primary and secondary raw materials, said process comprising a first leaching step wherein the ratio between the zinc weight contained in the raw material and the volume of the leaching solution is at least 20 kg zinc per m3 of acid aqueous...