ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,558, issued on June 3, was assigned to Heatcraft Refrigeration Products LLC (Stone Mountain, Ga.).

"CO 2 refrigeration system with isochoric compression" was invented by Arijit Mukherjee (Kalyani, India) and Sandesh Ramaswamy (Channarayapatna, India).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for operating a refrigeration system includes compressing a refrigerant received from a medium temperature (MT) evaporator unit using a MT compressor unit, and compressing the refrigerant received from a low temperature (LT) evaporator unit using a LT compressor unit. The method includes transferring heat from a portion of the refrigerant provided by...