ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,442, issued on March 18, was assigned to Massachusetts Institute of Technology (Cambridge, Mass.).

"Reaction schemes involving acids and bases; reactors comprising spatially varying chemical composition gradients; and associated systems and methods" was invented by Yet-Ming Chiang (Weston, Mass.), Leah Ellis (Nova Scotia, Canada) and Andres Badel (Deerfield Beach, Fla.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Reaction schemes involving acids and bases; reactors comprising spatially varying chemical composition gradients (e.g., spatially varying pH gradients), and associated systems and methods, are generally described. For example, methods co...