ALEXANDRIA, Va., June 16 -- United States Patent no. 12,307,421, issued on May 20, was assigned to Walmart Apollo LLC (Bentonville, Ark.).

"System and method for perpetual inventory management" was invented by Greg A. Bryan (Centerton, Ark.), Cristy C. Brooks (Cassville, Mo.), David Blair Brightwell (Bella Vista, Ark.), Benjamin D. Enssle (Bella Vista, Ark.), Matthew A. Jones (Bentonville, Ark.) and Jesse L. Eaton (Springdale, Ark.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A perpetual inventory (PI) value associated with the selected product and a last PI adjustment time that indicates when the retail store last adjusted the PI value are received. The PI value of the selected product is compared to the ...