ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,402, issued on Jan. 13, was assigned to Copeland Comfort Control LP (Kennesaw, Ga.).

"Demand defrost" was invented by Nathan Paul Burns (Huber Heights, Ohio), Abram Andrew Yorde (Englewood, Ohio), Emma Renee Allen (Bellbrook, Ohio), Gregory Scott Mickelson (Acworth, Ga.), Mohammed Makboul (Acworth, Ga.), Francois Aucoin (Montreal) and Mitchell R. Bolin (Piqua, Ohio).

According to the abstract* released by the U.S. Patent & Trademark Office: "A controller is configured to be operable for: triggering a defrost cycle when a gap between Control Temperature (CT) and Saturated Suction Temperature (SST) exceeds a defined threshold of an expected/learned gap between the Control Temperatu...