ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,253, issued on Jan. 27, was assigned to Heatcraft Refrigeration Products LLC (Stone Mountain, Ga.).

"Refrigeration system with expander-assisted cooling and methods of use" was invented by Saravana Vaithilingam Sakthivel (Oxford, Miss.) and Shitong Zha (Snellville, Ga.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of operating a refrigeration system is disclosed. The method comprises cooling a refrigerant using a first high side heat exchanger, and reducing the pressure of a first portion of the refrigerant received from the first high side heat exchanger using a first expansion valve in a first low side heat exchanger unit. The method fur...