ALEXANDRIA, Va., July 16 -- United States Patent no. 12,668,535, issued on June 30, was assigned to Air Products and Chemicals Inc. (Allentown, Pa.).

"Apparatus and process for calcining feed material" was invented by Jeffrey Carl Mocsari (Hamilton, N.Y.) and Anandkumar Makwana (Breinigsville, Pa.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A process for calcining a feed material can include passing a solid particulate material through a burner or adjacent a burner for being pass through a flame formed by the burner to facilitate calcination of the material. The material can be emitted from the flame of the burner within a calciner for passing through a body of the calciner to an outlet for further calcin...