ALEXANDRIA, Va., June 5 -- United States Patent no. 12,275,853, issued on April 15, was assigned to OMYA INTERNATIONAL AG (Oftringen, Switzerland).
"Process for preparing surface-reacted calcium carbonate" was invented by Daniel E. Gerard (Basel, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a process for producing a surface-reacted calcium carbonate, wherein a calcium carbonate-comprising material is treated with at least one inorganic acid and carbon dioxide in an aqueous medium to form an aqueous suspension of surface-reacted calcium carbonate, wherein the at least one water-soluble, inorganic magnesium salt is added before, during and/or after the treatment s...