ALEXANDRIA, Va., July 15 -- United States Patent no. 12,663,192, issued on June 23, was assigned to BITZER Kuehlmaschinenbau GmbH (Sindelfingen, Germany).
"Compressor/expander machine" was invented by Marcus Blumhardt (Rutesheim, Germany) and Juergen Nill (Moessingen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "In order to improve a method for operating a compressor/expander machine in a circuit for a working medium, wherein the compressor/expander machine has a machine housing with a screw rotor housing, in which at least one screw rotor arranged between a low-pressure side and a high-pressure side is arranged for compressing/expanding the working medium and is coupled to a motor/generator unit, ...