ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,441,621, issued on Oct. 14, was assigned to HATCH LTD..
"Treatment process for crystallizing a metal sulfate" was invented by Robert John Fraser (Oakville, Canada), Henry Christian Immo Von Schroeter (Toronto) and Mark Joseph Machado (Waterdown, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and/or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an...