ALEXANDRIA, Va., July 21 -- United States Patent no. 12,689,213, issued on July 21, was assigned to CARRIER Corp. (Palm Beach Gardens, Fla.).

"Grid shield" was invented by Florian Beaufrere (Rouen, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "A grid-shielded electrical system for a transportation refrigeration system is provided. The grid-shielded electrical system includes a bus to deliver three-phase grid power, which is received from a grid, to electrical components of the transportation refrigeration system, a voltage sensor disposed to sense a condition of voltage on the bus and configured to generate voltage readings accordingly and a controller disposed in signal communication with the voltag...