ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,200, issued on June 17, was assigned to Omya International AG (Oftringen, Switzerland).

"Production of surface-reacted calcium salts by grinding induced conversion" was invented by Daniel E. Gerard (Basel, Switzerland) and Lassi Karvonen (Basel, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a process for producing an aqueous suspension of surface-reacted calcium salt particles by mixing a calcium salt excluding monocalcium phosphate and dicalcium phosphate, a calcium phosphate selected from monocalcium phosphate and/or dicalcium phosphate, with water, and grinding the obtained aqueous suspension at a pH ...