ALEXANDRIA, Va., March 17 -- United States Patent no. 12,576,092, issued on March 17, was assigned to L. PERRIGO COMPANY (Allegan, Mich.).

"Pharmaceutical suspensions for bismuth subsalicylates" was invented by Inderdeep S. Bhatia (Kalamazoo, Mich.), David R. Cassiday (Caledonia, Mich.), Bruce D. Johnson (Byron Center, Mich.) and Carlos O. Paz (Fairview, N.J.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention is directed to pharmaceutical compositions for suspending bismuth subsalicylate and methods of use thereof. Formulations of the present invention include at least three-gum systems to prevent the settling out of heavy particles in solution and do not include magnesium aluminum silicate. The ph...